Adjustable Countersink Drill Bit – Carbide Wood Reamer

Adjustable Countersink Drill Bit – Precision Woodworking Reamer

Take your woodworking projects to the next level with this Adjustable Countersink Drill Bit. Engineered for both professional craftsmen and dedicated DIY enthusiasts, this carbide-tipped chamfer bit delivers perfectly flush, clean screw seats every single time — whether you're building furniture, installing cabinets, or crafting custom wood joinery.

Made in Mainland China.

Key Features

• Adjustable Depth Control (2.5mm–10.5mm): Fine-tune the countersink depth precisely for consistent, professional screw seating across every workpiece — no guesswork, no ugly exposed screw heads.
• Premium YG8 Carbide Cutting Head: The knife head is crafted from high-grade YG8 carbide alloy, delivering superior hardness, exceptional wear resistance, and long-lasting sharpness even under heavy use.
• 45# Steel Drill Body: The robust 45# steel shank provides rigidity and stability, minimizing vibration for cleaner, more accurate holes.
• Hex Screw Lock & Round Shank Chamfer: A secure hex screw firmly locks the bit in place during operation, while the round shank chamfer ensures quick, easy setup with a wide range of drills and woodworking tools.
• Versatile Material Compatibility: Performs excellently on pine, solid hardwood, MDF, and particleboard — covering virtually every common woodworking material.
• Multiple Sizes Available: Choose from 10 size options to perfectly match your screw requirements: 8×2.8mm, 8×3.0mm, 8×3.2mm, 8×3.5mm, 4.0×8mm, 2.8×10mm, 3.0×10mm, 3.2×10mm, 3.5×10mm, 4.0×10mm.

Specifications

Ideal Applications

• Furniture manufacturing and assembly
• Cabinet installation and joinery
• Hidden screw installation for clean finishes
• DIY woodcraft and home improvement projects
• Professional carpentry and workshop use

Important Notes

• Due to monitor/display variation, actual color may differ slightly from images.
• Please allow a tolerance of 1–3mm due to manual measurement.

Learn more: OSHA on personal protective equipment

Frequently Asked Questions

Q: What materials can this adjustable countersink drill bit work with?

A: This countersink drill bit is designed to work effectively on a wide variety of wood-based materials including pine, solid hardwood, MDF (medium-density fiberboard), and particleboard. Its YG8 carbide alloy cutting head maintains sharpness across these surfaces for consistent, clean results.

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

A: The bit features a simple adjustable core mechanism spanning 2.5mm to 10.5mm. Loosen the hex screw, slide the inner bit to your desired depth, then re-tighten the hex screw to lock it firmly in position before drilling.

Q: Which drill sizes and screw types is this countersink bit compatible with?

A: Ten size configurations are available — 8×2.8mm, 8×3.0mm, 8×3.2mm, 8×3.5mm, 4.0×8mm, 2.8×10mm, 3.0×10mm, 3.2×10mm, 3.5×10mm, and 4.0×10mm — allowing you to match the bit precisely to your screw head diameter and shank requirements for a perfect flush finish.

Q: Is this countersink bit compatible with standard power drills?

A: Yes. The round shank with chamfer design ensures secure, easy fitment with most standard power drills, cordless drills, and drill presses commonly used in woodworking and carpentry applications.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.