NEO TOOLS Diamond Core Drill Bit 68 mm x M14 for Porcelain, Granite, and Natural Stone

Diamond core drill bit for clean, chip-free holes in hard materials. The 68 mm cutting diameter with M14 thread mounts directly to angle grinders, while the vacuum-brazed diamond rim delivers high abrasion resistance and heat tolerance. Integrated side cooling holes support wet drilling for extended bit life and reduced dust, though short dry runs are possible. Ideal for cutting precise openings for pipes, cables, and fixtures in tile, stoneware, granite, marble, and other natural stone.

Advantages

Vacuum-brazed diamond technology ensures a strong, uniform bond between the diamond particles and the steel body, resulting in faster cutting and longer service life compared to electroplated bits. The continuous rim design produces smooth, chip-free edges without breakout, even on brittle materials like porcelain and marble. Side cooling holes allow water to reach the cutting zone, lowering operating temperature and preventing glazing of the diamond surface. The M14 thread provides a secure, tool-free connection to most angle grinders, and the 35 mm effective drilling depth covers typical tile and slab thicknesses.

Suitable for

• Porcelain and ceramic tiles
• Granite, marble, and natural stone
• Stoneware and hard floor tiles
• Creating holes for pipes, cables, and fixtures
• Wet drilling with angle grinders

Key specifications

• Cutting diameter: 68 mm
• Mounting thread: M14
• Overall length: 60 mm
• Effective drilling depth: 35 mm
• Rim type: continuous diamond rim
• Diamond bonding: vacuum brazed
• Body material: high-grade steel
• Cooling: integrated side holes (wet recommended)
• Compatible tools: angle grinders

Recommendations

For best results, use with a variable-speed angle grinder at moderate RPM and apply constant water flow to the cutting area. Start the hole at a slight angle to create a guide groove, then gradually bring the bit to vertical. Avoid excessive pressure; let the diamond rim do the work. For dry drilling, limit to short intervals and allow the bit to cool between passes.