RUBI Diamond Coated Drill Bit M14 35mm Dry Drilling for Porcelain Granite Marble

With a 35 mm diameter and vacuum brazed diamond grit, this RUBI drill bit delivers clean, chip-free holes in porcelain, granite, marble, and other dense materials. The M14 thread mounts directly onto angle grinders, and the internal wax core keeps the bit cool during dry drilling—no water feed required.

Overview

The RUBI Diamond Coated Drill Bit M14 35mm is a professional-grade core drill designed for dry drilling in hard, abrasive surfaces. It features a continuous diamond band that cuts smoothly through tile and stone without cracking or chipping. The M14 threaded shank ensures a secure fit on standard angle grinders, while the 30 mm drilling depth accommodates most wall and floor installations.

What stands out

• Vacuum brazed diamond coating for high wear resistance and long service life
• Internal wax cooling system prevents overheating during dry operation
• M14 thread for quick, tool-free mounting on angle grinders
• Continuous diamond band produces clean, precise holes with minimal breakout
• Ideal for electrical boxes, pipe penetrations, and anchor fixings

Technical details

• Diameter: 35 mm
• Drilling depth: 30 mm
• Shank type: M14 thread
• Drilling method: Dry
• Diamond type: Vacuum brazed
• Body material: Steel
• Max RPM: 14,000
• Series: DRYGRES
• Application materials: Porcelain, stoneware, granite, marble, ceramic tiles, natural stone

Our verdict

For tilers and stone fabricators who need fast, clean holes without water, the RUBI M14 diamond drill bit is a reliable choice. Its brazed diamond edge and wax cooling system keep it cutting efficiently even in the toughest materials.