General description The Diamond Glass Hole Saw Drill Bit with Center Pilot Bit is designed for precision drilling in glass, ceramic tiles, stone, and granite. It features a pilot bit that ensures accurate hole cutting and a diamond coating that provides sharp and smooth cutting edges, resulting in high-precision finishes without broken edges. Technical specifications Diameter: 35mm Material: Diamond, Carbon Steel Finish: White Zinc Plating Package: 1 piece Usage Water lubrication is required during drilling to enhance performance and prolong the life of the bit. Best used with an electric drill (not included). Avoid using on concrete or drilling beyond approximately 1/2 inch in depth. Other information Reduced drilling speeds and low pressure will extend the life of the drill bit. The clearance hole allows for cooling water entry and chip evacuation. Produces clean, accurate holes in minutes with minimal chipping.