Adjustable Countersink Drill Bit – Carbide Woodworking Reamer

Adjustable Countersink Drill Bit – Precision Woodworking Reamer

Achieve perfectly flush, hidden screw holes every time with this professional-grade adjustable countersink drill bit. Whether you're crafting furniture, assembling cabinets, or tackling DIY home projects, this carbide-tipped reamer delivers consistent, clean results across a wide range of wood materials.

Made in Mainland China.

Key Features

• Adjustable Depth Control: Features a 2.5mm–10.5mm adjustable core for precise countersink depth, ensuring consistent, professional screw seating on every pass.
• Premium Carbide Construction: The cutting head is crafted from YG8 alloy carbide and the drill body from 45# steel — delivering superior hardness, wear resistance, and long-lasting durability even under heavy use.
• Secure & Stable Setup: A hex locking screw holds the bit firmly in place, while the round-shank chamfer design ensures easy, reliable mounting with a wide variety of woodworking drills and tools.
• Versatile Wood Compatibility: Works seamlessly on pine, solid hardwood, MDF, particleboard, and engineered wood — available in multiple sizes to match different screw gauges and project requirements.
• Corrosion-Resistant Finish: The treated steel body resists rust and corrosion, keeping your bit performing like new job after job.

Specifications

• Cutting Head Material: YG8 Alloy Carbide
• Drill Body Material: 45# Steel
• Adjustable Core Range: 2.5mm – 10.5mm
• Available Sizes: 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
• Package Includes: 1× Adjustable Countersink Drill Bit

Applications

• Furniture making & wood joinery
• Hidden screw installation & concealed fastening
• Cabinet processing & assembly
• DIY woodcraft and home carpentry projects
• Construction site use

Important Notes

• Due to lighting and display differences, colors may appear slightly different from images.
• Please allow 1–3mm measurement tolerance due to manual sizing.

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Frequently Asked Questions

Q: What materials can this adjustable countersink drill bit be used on?

A: This countersink drill bit is designed for use on a wide range of wood materials, including pine, solid hardwood, MDF (medium-density fiberboard), particleboard, and other engineered wood products. It is ideal for furniture making, cabinet assembly, and general woodworking projects.

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

A: The drill bit features an adjustable core ranging from 2.5mm to 10.5mm. Simply loosen the hex locking screw, slide the bit to your desired depth, and re-tighten the hex screw to lock it firmly in place. This allows you to achieve perfectly consistent countersink depth for any screw size.

Q: Is this countersink bit compatible with standard drills and woodworking tools?

A: Yes. The round-shank chamfer design ensures the bit fits securely and easily into most standard drills and woodworking tools, making setup quick and hassle-free for both professional and DIY use.

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.