Diamond Step Chamfer Bits 20/35/50mm – Tile, Marble & Masonry

Diamond Step Chamfer Bits — Clean, Precise Hole Enlarging in Hard Surfaces

Tackle marble, ceramic tile, masonry, and concrete with confidence using these Diamond Step Chamfer Drill Bits. Available in three sizes — 20mm, 35mm, and 50mm — these hex shank bits are engineered for fast, accurate hole enlarging and chamfering without cracking or chipping your work surface.

Whether you're a professional tradesperson or a serious DIYer, these bits deliver the precision and durability needed for demanding hard-surface drilling projects.

Key Features

• 3 Sizes Included: 20mm, 35mm, and 50mm diameters to suit a wide range of project requirements
• Diamond-Tipped Cutting Edge: Industrial-grade diamond abrasive ensures clean, smooth hole enlargement with minimal surface stress
• M10 Interface: Fully compatible with standard angle grinders and marble cutters; can also be used with electric drills when paired with a connecting rod adapter
• Hex Shank Design: Secure, slip-resistant connection for stable performance at high RPM
• Step Chamfer Profile: Simultaneously enlarges and chamfers holes in one pass, saving time and reducing finishing work
• Versatile Material Compatibility: Ideal for marble, granite, ceramic tile, porcelain, masonry, brick, and concrete
• Durable Construction: High-quality materials ensure long service life even in tough working conditions

Specifications

• Diameters: 20mm / 35mm / 50mm
• Interface: M10 (angle grinder / marble cutter compatible)
• Shank Type: Hex
• Compatible Tools: Angle grinders, marble cutters, electric drills (with connecting rod)
• Suitable Materials: Marble, tile, porcelain, masonry, concrete, granite
• Made in Mainland China

What You Get

One set of 3 diamond step chamfer bits (20mm, 35mm, 50mm). Perfect for bathroom renovations, kitchen tile work, stone countertop installations, and general masonry projects.

Safety Tip

Always wear appropriate personal protective equipment including eye protection and gloves when operating angle grinders or power drills. For safe tool use guidelines, refer to the OSHA Power Tools Safety Resource.

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Frequently Asked Questions

Q: What materials can these diamond step chamfer bits cut through?

A: These diamond step chamfer drill bits are designed for hard surfaces including marble, granite, ceramic tile, porcelain, masonry, brick, and concrete. They are not intended for use on wood or metal.

Q: Do these bits fit a standard angle grinder?

A: Yes. The M10 interface is compatible with most standard angle grinders and marble cutters. To use with an electric drill, simply add an M10 connecting rod adapter (sold separately).

Q: What is the difference between the three sizes?

A: The 20mm bit is ideal for smaller fixtures and pipe pass-throughs; the 35mm bit suits standard plumbing and hardware holes; the 50mm bit is perfect for larger pipes, drains, or decorative features in stone and tile surfaces. All three enlarge and chamfer in a single pass.

Q: Should I use water when drilling with these bits?

A: Using water as a coolant is recommended when drilling into hard materials like marble, granite, or porcelain tile. It helps extend the life of the diamond tip and reduces dust generation for a cleaner, safer work environment.