4-Piece Countersink Drill Bit Set – 3–6mm Wood Screw Bits

4-Piece Three-Point Countersink Drill Bit Set | 3–6mm Woodworking Pilot Holes

Upgrade your woodworking toolkit with this versatile 4-piece countersink drill bit set, covering sizes 3mm, 4mm, 5mm, and 6mm. Each bit combines a twist drill and countersink in a single tool — so you drill your pilot hole and chamfer the screw seat in one smooth pass. The result? Perfectly flush screws, zero splitting, and a professional finish every time. Made in China.

Key Features

• 4 Sizes Included: 3mm, 4mm, 5mm, and 6mm bits cover all common wood screw sizes for furniture, cabinetry, joinery, and crafts.
• Three-Point Centering Tip: The precision-ground three-point pilot tip self-centers on the workpiece, preventing walking or slipping for perfectly placed, clean holes every time.
• Dual-Function Drill + Countersink: Each bit simultaneously drills the pilot hole and chamfers the screw seat, saving you time and delivering flush, professional screw installation in one step.
• High-Carbon Steel Construction: Precision-ground cutting edges made from hardened high-carbon steel stay sharper longer and resist wear through repeated use in both hardwood and softwood.
• Adjustable Countersink Depth: A set screw on each bit body (tightened or loosened with the included Allen wrench) lets you fine-tune the countersink depth for consistent, repeatable results across your entire project.
• Free Allen Wrench Included: Quick, tool-free depth adjustments keep your workflow smooth and efficient.

Specifications

• Set Contents: 4 countersink drill bits (3mm, 4mm, 5mm, 6mm) + 1 Allen wrench
• Bit Type: Brad-point / Three-point countersink (pilot + chamfer combo)
• Material: High-carbon steel
• Compatible Materials: Softwood, hardwood, plywood, MDF, chipboard
• Country of Origin: Made in China

Perfect For

• Furniture assembly and flat-pack projects
• Cabinet making and shelving installation
• Joinery and timber framing
• DIY home improvement and craft projects
• Professional woodworking workshops

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Safety & Standards Reference

For guidance on safe tool use and power tool safety practices, visit the OSHA Hand & Power Tools Safety page. Always wear appropriate eye protection when drilling.

Frequently Asked Questions

Q: What sizes are included in this countersink drill bit set?

A: The set includes four brad-point countersink drill bits in 3mm, 4mm, 5mm, and 6mm sizes, plus a free Allen wrench for depth adjustment — covering the most common wood screw hole sizes for furniture, cabinetry, and general woodworking.

Q: Can these countersink bits be used in a standard cordless drill?

A: Yes! These bits feature a standard round shank compatible with most cordless drills, drill presses, and power screwdrivers. Simply chuck them in as you would any other twist bit.

Q: How do I adjust the countersink depth on each bit?

A: Each bit has a set screw on the countersink collar. Use the included Allen wrench to loosen the set screw, slide the drill bit to your desired depth, then re-tighten. This lets you match the countersink depth exactly to your screw head for a flush, professional finish.

Q: Are these bits suitable for hardwood as well as softwood?

A: Yes. The bits are made from hardened high-carbon steel with precision-ground cutting edges, making them suitable for both softwoods (pine, cedar) and hardwoods (oak, maple, walnut). For very dense hardwoods, drilling at a moderate speed and clearing chips frequently will help maintain edge sharpness.

Q: What is the difference between a countersink bit and a regular drill bit?

A: A standard drill bit creates a cylindrical hole, while a countersink bit (like those in this set) creates a pilot hole AND a conical recess in one pass. The conical recess allows the screw head to sit flush with — or below — the wood surface, giving a clean, professional appearance and preventing wood splitting around the screw head.