NEO TOOLS Diamond Core Drill Bit 65 mm M14 Vacuum Brazed for Ceramic, Porcelain, Granite, Marble, Glass

Cutting clean, precise holes in hard, brittle materials like porcelain tiles and granite countertops demands a bit that stays sharp and runs true. The NEO TOOLS 55-314 diamond core drill bit delivers exactly that, with a 65 mm diameter and M14 thread for direct mounting on angle grinders. Its vacuum-brazed diamond coating grinds through ceramics, porcelain, tiles, granite, marble, natural stone, and even glass without chipping or cracking, making it a go-to for electricians, plumbers, and tilers who need reliable, dry drilling on the job.

Key specifications

• Drilling diameter: 65 mm
• Mounting thread: M14 (fits standard angle grinders)
• Working depth: 35 mm
• Drilling method: Dry drilling – no water or coolant required
• Diamond coating: Vacuum brazed for high wear resistance
• Body material: High-quality steel for durability
• Compatible materials: Ceramics, porcelain, tiles, granite, marble, natural stone, glass
• Recommended use: Professional and DIY applications

Why choose it

The vacuum brazed diamond layer stays sharp far longer than electroplated bits, and the open design prevents clogging when cutting through dense stone. The M14 thread allows quick, tool-free mounting on most angle grinders, so you can move from marking to drilling in seconds. Because it works dry, there is no mess from water cooling, and you can use it in finished spaces without worrying about slurry cleanup.

Ideal use cases

• Cutting holes for electrical boxes in tiled walls
• Creating openings for pipes and fittings through porcelain or stone
• Making clean holes in granite or marble countertops for faucets
• Drilling glass for decorative or functional purposes
• Professional tile installation and renovation work

Good to know

For best results, start the cut at a slight angle and gradually bring the bit upright to reduce wandering. The bit is designed for dry use only, so do not apply water or cutting fluid. Always wear appropriate safety gear, including eye protection and a dust mask, when drilling stone or ceramic materials.