Diamond Step Drill Bits – 20mm, 35mm & 50mm

Fast & Precise Hole Expansion

Designed for enlarging and finishing existing holes, this multilayered diamond cone reamer provides smooth, controlled hole expansion without the need for multiple cutting tools. The stepped profile allows you to gradually increase hole diameter for cleaner and more consistent results.

Three Sizes for Different Applications

Available in three practical sizes to handle a wide range of hole-opening tasks:

• 20mm (0.79")
• 35mm (1.38")
• 50mm (1.97")

The stepped design gives you greater flexibility when adjusting existing holes to the required diameter.

Diamond Multi-Layer Cutting Design

The diamond-coated working surface is engineered for efficient material removal and extended cutting performance. The multilayered cone profile allows gradual cutting and helps improve control when enlarging holes in hard materials.

Suitable for:

• Tile
• Marble
• Engineered stone
• Concrete
• Metal
• Wood
• Other compatible construction materials

M10 Thread for Easy Tool Compatibility

Featuring an M10 threaded connection, this cone reamer is designed for use with compatible grinders and rotary tools. The compact 12mm (0.47") height makes it easy to handle while working in confined areas.

Smooth Beveling & Chamfering

Beyond simple hole enlargement, the tapered profile can also be used for beveling, chamfering, and edge finishing on compatible materials. It helps clean up rough or uneven openings and creates a more finished appearance.

Built for Professional & DIY Work

A practical addition to the toolbox for contractors, fabricators, installers, technicians, and DIY users working on renovation, construction, and machining projects.

Ideal For:

• Hole enlargement
• Hole finishing
• Chamfering
• Beveling
• Tile installation
• Stone fabrication
• Concrete work
• Metalworking
• Construction and renovation
• DIY projects

Product Features

• Multilayered diamond cone design
• Available in 20mm, 35mm & 50mm sizes
• Gradual hole expansion
• Designed for hard materials
• M10 threaded connection
• Suitable for compatible grinders and rotary tools
• Useful for drilling, chamfering and beveling applications
• Suitable for professional and DIY use

Note: This is designed primarily for enlarging and finishing existing holes rather than creating large holes from solid material. Confirm the M10 thread and tool compatibility before use. Always wear appropriate eye, respiratory, and protective equipment when cutting or grinding.