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- Woodriver Forstner Bit Extension 1/2" X 4"
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46538045
Woodriver Forstner Bit Extension 1/2" X 4"
87% of respondents would recommend this to a friend
Item #:
46538045
BSD 36
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Forstner bit extension adds 4” to length of forstner bit
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What Stands Out
Extended Reach
The 4-inch extension allows for deeper drilling, making it ideal for projects requiring extra depth without compromising precision, thus catering to professional woodworkers and enthusiasts alike.
High Compatibility
Designed to fit standard 1/2-inch shank Forstner bits, ensuring versatility and ease of use across various woodworking projects, addressing compatibility issues faced by craftsmen.
Durable Construction
Crafted from high-quality materials, this extension offers exceptional durability, allowing for consistent performance and longevity, making it a reliable choice for both casual users and woodworking professionals.
Product Details
- Compatible with WoodRiver forstner bits only
- Adds 4” to length of forstner bit
- Socket fits forstner bits with 1/2” diameter shanks
- Secures forstner bit with two set screws
- 1/2” diameter drive shank allows use of multiple extensions
- Manufactured by Woodcraft, a leading provider of woodworking tools and supplies
| Brand Name | WOODRIVER |
| Model | 145706W |
| UPC | 844788004245 |
| Unit Count | 1 Count |
| Number of Packs | 1 |
| Manufacturer | Woodcraft Supply |
| Part Number | 145706W |
| Item Weight | 5.92 ounces (167.83 grams) |
| Cutting Diameter | 12.7 millimeters |
| Item Dimensions | 2.35 x 4.95 x 1.1 inches (6 x 12.6 x 2.8 cm) |
| Minimum Bore Diameter | 0.38 inches (1 cm) |
| Material Type | Wood |
| Finish Types | Uncoated |
| Shank Type | Straight |
| Surface Recommendation | Wood |
| Tool Flute Type | Straight |
| Point Style | Brad Point |
| Number of Flutes | 2 |
| Material | Wood |
| Finish Type | Uncoated |
| Brand | WOODRIVER |
Who Should Buy?
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Woodworkers
Ideal for woodworkers looking to create clean and precise holes in thicker materials using Forstner bits.
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DIY Enthusiasts
Great for hobbyists who frequently use Forstner bits and need an extra reach for deeper drilling applications.
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Professional Craftsmen
Perfect for professionals needing versatility and enhanced drilling capacity in furniture or cabinetry projects.
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Beginners
Not suitable for beginners who may find using extensions complicated and challenging without proper experience.
Product Description
Woodriver Forstner Bit Extension 1/2" X 4"
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What is a Forstner bit extension and what is it used for?
Answer: A Forstner bit extension, such as the 1/2" x 4" model, is designed to increase the drilling depth of Forstner bits. They are particularly useful for woodworking projects that require precise, flat-bottomed holes in hard materials like hardwood and plywood. This extension allows you to achieve deeper cuts without compromising the quality of the hole, making it ideal for cabinetry, furniture making, and creating dowel holes. -
Question:
What size drill chuck is required for the Forstner Bit Extension?
Answer: The Forstner Bit Extension requires a drill chuck that can accommodate a 1/2" shank. It's important to ensure your drill or drill press has a compatible chuck size to accept the extension securely. This allows for a steady grip, ensuring that you can drill larger and deeper holes with stability and accuracy during your projects. -
Question:
Can I use the Forstner Bit Extension with other types of drill bits?
Answer: While the Forstner Bit Extension is specifically designed for Forstner bits, it can be used with other bits that have a compatible 1/2" shank size. However, for optimal performance and results, it is recommended to use it with Forstner bits, as they are designed for precision and efficiency in creating flat-bottom holes, which enhances the quality of your work. -
Question:
How do I maintain the Forstner Bit Extension?
Answer: Maintaining your Forstner Bit Extension involves keeping it clean and free of debris after each use, as well as ensuring it is stored in a dry place to prevent rust. Periodically check for any signs of wear or damage, especially on the shank, to guarantee optimal performance. Proper maintenance ensures longevity and reliability when working on your projects. -
Question:
What materials can I drill through using the Forstner Bit Extension?
Answer: The Forstner Bit Extension is suitable for drilling through a variety of materials, including hardwoods, softwoods, plywood, and composite materials. This versatility makes it a go-to tool for woodworkers and DIY enthusiasts for tasks ranging from furniture making to crafting intricate joinery, allowing users to tackle numerous projects without changing bits frequently. -
Question:
Is the Forstner Bit Extension compatible with cordless drills?
Answer: Yes, the Forstner Bit Extension can be used with cordless drills as long as the drill has a chuck that fits the 1/2" shank size. Using it with a cordless drill provides mobility and convenience, especially in locations where a power outlet may not be readily available. This flexibility makes it an ideal tool for on-site woodworking projects. -
Question:
What is the maximum depth achievable with the Forstner Bit Extension?
Answer: The 4" length of the Forstner Bit Extension allows for drilling holes up to 4" deep. This depth is perfect for various woodworking applications such as creating large dowel holes, recesses for hardware, or even rough cuts for plumbing and electrical installations. This feature enhances the functionality of Forstner bits significantly, making them more versatile. -
Question:
Can I use multiple extensions together for deeper drilling?
Answer: Using multiple Forstner Bit Extensions together is not recommended, as it may compromise stability and accuracy while drilling. Instead, it's best to use a single extension that meets your required depth. Achieving depth with a single quality extension ensures that your drilling remains precise and reduces the risk of damaging your workpiece. -
Question:
Are there any safety precautions to take while using the Forstner Bit Extension?
Answer: When using the Forstner Bit Extension, always wear protective eyewear and ensure your workspace is clear of hazards. Properly secure your workpiece to prevent movement while drilling, and grip the drill firmly to maintain control. Following these safety measures ensures a safer working environment and mitigates the risk of accidents during the drilling process. -
Question:
Where can I buy the Forstner Bit Extension, 1/2" x 4"?
Answer: You can purchase the Forstner Bit Extension, 1/2" x 4", from Ubuy, which offers a reliable selection of tools and accessories for your woodworking needs. Ubuy provides a user-friendly platform to find the specific items you require, ensuring you have the right tools to complete your projects efficiently and effectively.
WOODRIVER Forstner Drill Bits Editorial Review
The Forstner Bit Extension is a tool designed to extend the length of drill bits, particularly useful in projects such as lathe turning or when drilling long holes. This extension is perfect for use with heavy-duty Forstner bits, such as those from Lee Valley, and it fits the hex-shank of the bits. According to the customers, this product is great for drill extensions and works perfectly, as well as being a necessary accessory for long hole drilling. One user has used it with a router planer bit to remove bumps. However, one reviewer was disappointed as they had a 1/2" chuck for their lathe and the shank of this product was too big to fit in, and they had to have it turned down to use it. Overall, the Forstner Bit Extension is a well-made and handy tool to add to any drill set.
Customer Reviews & Ratings
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Pros
- Perfect for drill extensions and extending long holes
- Fits the hex-shank of Forstner bits from brands like Lee Valley
- Well made and runs true and smooth when used in conjunction with extender
Cons
- May not fit in certain chucks and may need to be modified to fit
Platform Trust & Buyer Confidence
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Jazz
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“Easy to use and always helpful and sorts any issues I've had past and present”
1 September 2026 · via Trustpilot
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“Fast, convenient and cheap. Great store!”
27 August 2026 · via Trustpilot
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Features & Benefits
- Extension designed for WoodRiver forstner bits only
- Socket accepts forstner bits with 1/2” diameter shanks
- Forstner bit held in extension socket with two set screws
- 1/2” diameter drive shank allows use of multiple extensions
- WoodRiver is proudly made by Woodcraft, America’s leading supplier
- Wide range of woodworking products available
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