Tackle precise woodworking projects with the Irwin Marples 1-1/8 in. x 4 in. L Forstner drill bit. Crafted from robust carbon steel, this bit is designed to deliver clean, chip-free holes with a flat bottom—perfect for mortises, hardware recesses, and joinery that demands accuracy.
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Drill size: 1-1/8 in
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Overall length: 4 in
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Shank diameter: 3/8 in
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Shank type: Round shank
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Material: Carbon steel
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Brand / Line: Irwin Marples (Forstner drill bit)
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Packaging: Boxed (1 piece)
Why a Forstner bit is a smart choice for woodworking
Forstner bits carve clean, square-edged holes with minimal tear-out, making them ideal for precision work in cabinetry, furniture, and carpentry. The flat-bottom design provides consistent depth, which is essential when installing hinges, dowels, or hardware that sits flush against surfaces.
Ideal use cases
- Creating deep, flat-bottom mortises for dowels, hinges, and hardware fittings
- Precise pocket holes for cabinetry, shelves, and decorative joinery
- Furniture-making tasks that require accurate, repeatable holes in soft and hardwoods
Performance you can rely on
The Irwin Marples line is built for real-world workshop use. A 3/8" round shank ensures secure grip in standard drill chucks, while the 4" overall length provides reach in deeper workpieces without sacrificing control. Carbon steel offers durability and ease of sharpening, so you can maintain a razor edge for accurate cuts over time.
Practical tips for best results
- Start with a light bite to establish the hole, then increase feed gradually to maintain clean edges.
- Use steady pressure and moderate speed; avoid overheating to preserve edge sharpness.
- Keep the bit cool and clean; wipe away debris after each hole to maintain accuracy.
