General description Diamond Glass Hole Saw Drill Bit is designed for creating precise holes in glass, ceramic, porcelain, tile, and stone. It features a center positioning drill bit that ensures accurate hole cutting and a clearance hole that facilitates the entry of cooling water and the evacuation of drilling chips. This drill bit is engineered for clean and smooth cutting, producing high-precision holes without broken edges. Technical specifications Diameter: 25mm Material: Diamond with white zinc plating Maximum drilling depth: Approximately 1/2 inch Usage Always use lubrication (water) during drilling. Recommended to operate at low drilling speed and pressure. Not suitable for drilling tempered glass, plastic, wood, or concrete. Works best with an electric drill (not included). Other information Diamond drill bits with clearance hole enhance cooling and chip evacuation. Extended tool life due to reduced drilling pressure and increased water lubrication.