3-Flute Countersink Drill Bit 90° Chamfering Tool Set – HSS

3-Flute Countersink Drill Bit | 90° Chamfering Tool Set

Upgrade your workshop with this precision-engineered 3-Flute Countersink Drill Bit — the go-to chamfering solution for woodworkers, metalworkers, and DIY enthusiasts alike. Designed with a 90-degree cutting angle, this high speed steel (HSS) countersink bit delivers clean, accurate chamfers and countersinks in both wood and metal without chipping or tearing the material surface.

Key Features

• High Speed Steel (HSS) Construction: Engineered for lasting durability and cutting performance across wood, soft metal, and composite materials.
• 3-Flute Design for Superior Chip Clearance: The triple-flute geometry efficiently removes chips during chamfering, keeping the bit clear and your workflow uninterrupted.
• 90-Degree Chamfer Angle: Produces perfectly angled countersink holes for flathead screws and bolts — no secondary finishing needed.
• 6 Sizes Included: Covers a wide range of applications with sizes 6.3 / 8.3 / 10.4 / 12.4 / 16.5 / 20.5 mm, so you always have the right bit on hand.
• Re-Grindable Blades: The blade can be sharpened without removing it from the tool, making maintenance fast and cost-effective.
• Universal Compatibility: Fits standard drill presses and handheld drills; ideal for cabinetry, furniture assembly, automotive work, and general fabrication.
• 7 Color Options Available: Choose a color option that suits your style or helps you organize your toolkit.

Product Specifications

• Material: High Speed Steel (HSS)
• Flutes: 3
• Chamfer Angle: 90°
• Sizes: 6.3mm / 8.3mm / 10.4mm / 12.4mm / 16.5mm / 20.5mm
• Compatible Materials: Wood, Soft Metal, Plastic, Composite
• Color Options: 7 variants available

Why Choose This Countersink Bit?

Whether you're a seasoned tradesperson or a weekend DIYer, this countersink set earns its place in every toolbox. The multi-flute design minimizes vibration and delivers smooth, professional-looking results every time. And because the blades can be re-ground on the tool — no disassembly required — you get maximum value from every bit in the set.

For additional guidance on safe power tool practices, visit the OSHA Power Tools Safety resource.

Learn more: Countersink

Frequently Asked Questions

Q: What materials can this 3-flute countersink drill bit cut through?

A: This HSS countersink bit is designed to work effectively on wood, soft metals, plastics, and composite materials. Its high speed steel construction provides the hardness and heat resistance needed to maintain a sharp edge across these material types.

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

A: The set includes six sizes: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, and 20.5mm — covering a broad range of screw and bolt head sizes for wood and metalworking projects.

Q: Can the blades on this countersink bit be sharpened?

A: Yes! One of the standout features of this chamfering tool is that the blades can be re-ground (sharpened) without unloading or disassembling the bit from the tool. This makes maintenance quick and convenient, extending the life of your investment.

Q: What drill types are compatible with this countersink bit?

A: This 3-flute countersink drill bit is compatible with standard handheld drills and drill presses. Simply select the appropriate shank size to fit your chuck and you're ready to work.

Q: Is this countersink bit suitable for flathead screw applications?

A: Absolutely. The 90-degree chamfer angle is specifically designed to create clean countersink recesses that allow flathead screws and bolts to sit flush with or below the surface of your workpiece — ideal for furniture making, cabinetry, and metal fabrication.