Adjustable Countersink Drill Bit – Carbide Woodworking Reamer

Adjustable Countersink Drill Bit for Precision Woodworking

Achieve perfectly flush, hidden screw holes every time with this professional-grade adjustable countersink drill bit. Engineered for both seasoned woodworkers and DIY enthusiasts, this countersunk reamer delivers consistent, clean results on a wide variety of wood materials — from pine and solid hardwood to MDF and particleboard.

Made in Mainland China.

Key Features

• Adjustable Depth Control (2.5mm–10.5mm): Dial in the exact countersink depth for consistent, professional screw seating on every project — no guesswork, no rework.
• Premium YG8 Carbide Cutting Head: The knife head is crafted from YG8 alloy carbide steel paired with a 45# steel drill body, delivering exceptional hardness, wear resistance, and long-lasting sharpness.
• Secure Hex-Lock Design: A hex locking screw holds the bit firmly in place during operation, while the round shank chamfers allow fast, easy insertion into any standard drill or driver chuck.
• Corrosion-Resistant Construction: Built to handle the demands of construction sites and everyday home workshops without degrading over time.
• Versatile Size Options: Available in multiple 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, and 4.0×10mm — to match different screw types and project needs.

Ideal Applications

• Furniture making & wood joinery
• Hidden screw installation in cabinetry
• DIY woodcraft and home improvement projects
• Construction site carpentry
• Cabinet processing and panel assembly

Specifications

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Note: Due to monitor/display variations, colors may appear slightly different from the actual product. Please allow 1–3mm tolerance due to manual measurement.

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Frequently Asked Questions

Q: What wood types is this adjustable countersink drill bit compatible with?

A: This countersink drill bit works excellently on pine, solid hardwood, MDF, and particleboard, making it suitable for a wide range of woodworking and carpentry applications including furniture making, cabinet assembly, and DIY home projects.

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

A: The bit features a hex locking screw mechanism. Simply loosen the hex screw, slide the bit to your desired depth within the 2.5mm–10.5mm adjustable range, then re-tighten the screw to lock it in place before drilling.

Q: Which drill chucks is this countersink reamer compatible with?

A: Thanks to its round shank with chamfers, this countersink drill bit is compatible with most standard drill chucks and driver chucks commonly used in woodworking tools, ensuring versatile and secure setup.

Q: What size countersink drill bit should I choose for my project?

A: Select the size based on your screw diameter and shank. For most standard wood screws, the 8×3.0mm or 8×3.2mm options are popular choices. For larger or smaller screws, refer to the available size chart: 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.

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.