Countersink Drill Bit Set – 4 Sizes, Adjustable Depth Stop

Countersink Drill Bit Set – Alloy Build, Spiral Flute, Adjustable Depth Stop

Take your woodworking projects to the next level with this professional-grade Countersink Drill Bit Set. Built from durable cobalt steel alloy, this 6-piece kit delivers clean, precise countersunk holes in wood, MDF, particleboard, plywood, and synthetic fiberboard — every single time. Whether you're a DIY enthusiast or a seasoned craftsperson, this set has everything you need for a flawless finish.

Made in Mainland China.

Why You'll Love This Set

• Premium Alloy Construction: Made from cobalt steel alloy for superior cutting performance, wear resistance, and long-lasting durability. These bits won't snap or dull easily under regular use.
• 4 Versatile Sizes Included: Comes with four interchangeable replacement drill bits to cover a wide range of screw sizes:
  • 2.8 × 80 mm (0.11 × 3.15 in)
  • 3.2 × 80 mm (0.13 × 3.15 in)
  • 3.5 × 100 mm (0.14 × 3.94 in)
  • 4.0 × 100 mm (0.16 × 3.94 in)
• Spiral Flute Design: The precision-engineered spiral edge channels wood debris and dust away from the hole as you drill, preventing clogging and ensuring a smooth, uninterrupted drilling process.
• Adjustable Depth Stop: The built-in depth limiter with cross-reference scale markings lets you set the exact drilling depth for different screw lengths — no guesswork, no over-drilling, just consistent, professional results every time.
• Anti-Clogging Performance: The grooved spiral design actively clears shavings from the cutting zone, keeping the bit running cleanly and efficiently through your workpiece.
• Wide Application: Ideal for natural wood, MDF, particleboard, plywood, and synthetic fiberboard. Not recommended for use on metals or steel plates.

What's in the Box

• 1 × Countersink Drill Body (Length: 80mm / 1.18 in widest diameter: 30mm)
• 4 × Replacement Drill Bits (2.8mm, 3.2mm, 3.5mm, 4.0mm)
• 1 × Hex Wrench

Specifications

Related Products You May Like

• 10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips — perfect companion screws for your countersunk holes.
• 10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories — more precision tool accessories for your workshop.
• 10/20mm Diamond Flat Grinding Wheel Dry and Wet Use Heavy Duty — expand your drilling and grinding toolkit.

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Frequently Asked Questions

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

A: This countersink drill bit set is designed for use on natural wood, MDF, particleboard, plywood, and synthetic fiberboard. It is not recommended for drilling into metals or steel plates.

Q: Can I adjust the drilling depth with this set?

A: Yes! The countersink drill body features an adjustable depth stop (depth limiter) with cross-reference scale markings, allowing you to precisely set the drilling depth to match different screw lengths — giving you consistent, accurate results every time.

Q: How do I change the drill bits?

A: Changing bits is simple. Use the included hex wrench to loosen the bit collar, swap in the desired size (2.8mm, 3.2mm, 3.5mm, or 4.0mm), and tighten securely before drilling.

Q: What makes the spiral flute design beneficial?

A: The spiral flute channels wood shavings and dust outward from the cutting zone as you drill, preventing debris build-up and clogging. This keeps the bit cutting smoothly and cleanly, reducing effort and improving hole quality.

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.