Cobalt Steel Eccentric Drill Bits for Glass, Tile & Ceramic

Tackle tough drilling jobs with confidence using this Cobalt Steel Eccentric Drill Bit Set. Engineered for precision cutting through hard surfaces — including glass, ceramic tile, porcelain, rock slabs, and more — these offset eccentric bits deliver clean, accurate holes every time. Available in 6 mm, 8 mm, 10 mm, and 12 mm diameters to handle a wide range of project needs.

Why Choose These Eccentric Drill Bits?

• High-Hardness Cobalt Steel Alloy Construction — Exceptionally durable material that maintains sharpness through demanding tasks on glass, tile, and ceramic surfaces.
• Eccentric (Offset) Cutting Design — The unique off-center geometry reduces chipping and cracking for smooth, precise holes in brittle materials.
• Multi-Size Versatility — Set includes 6 mm, 8 mm, 10 mm, and 12 mm bits to cover everyday drilling requirements.
• Wide Material Compatibility — Performs on glass, ceramic tile, porcelain tile, rock slabs, and similar hard surfaces.
• 2 Color Options Available — Choose the style that suits your toolbox.
• Dependable Performance — Built for both professional tradespeople and dedicated DIY enthusiasts who demand accuracy.

Product Specifications

• Material: Cobalt Steel Alloy
• Available Sizes: 6 mm, 8 mm, 10 mm, 12 mm
• Bit Type: Eccentric (Offset) Drill Bit
• Compatible Surfaces: Glass, Ceramic Tile, Porcelain, Rock Slab
• Drive Type: Standard round shank (fits most drills)
• Color Options: 2 available
• Brand: Qme

Ideal For

• Tiling and renovation projects
• Glass work and custom glazing
• Bathroom and kitchen installations
• Stone and slab countertop drilling
• Professional trades and serious DIY builds

For guidance on safe tool use and best practices when working with hand tools, visit the U.S. Occupational Safety and Health Administration (OSHA) Hand and Power Tools page.

Frequently Asked Questions

Q: What materials can the Cobalt Steel Eccentric Drill Bits cut through?

A: These eccentric drill bits are designed for hard, brittle surfaces including glass, ceramic tile, porcelain tile, rock slabs, and similar materials. The cobalt steel alloy construction provides the hardness needed to drill cleanly through these tough substrates without excessive chipping.

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

A: The set is available in four diameters: 6 mm, 8 mm, 10 mm, and 12 mm. This range covers the most common hole sizes needed for tile and glass work, from small fixture holes to larger openings for pipes or hardware.

Q: What is an eccentric (offset) drill bit and why does it matter for glass and tile?

A: An eccentric drill bit features an off-center cutting geometry that reduces the lateral stress applied to brittle materials like glass and ceramic tile as the bit enters the surface. This design minimizes cracking and chipping, resulting in cleaner, more precise holes compared to standard twist bits.

Q: Are these bits compatible with standard drills?

A: Yes. The bits feature a standard round shank that fits most conventional corded and cordless drills. For best results on glass and tile, use with a variable-speed drill at a low, steady speed and apply gentle, consistent pressure.