Red Ten ULTRA Wetdry 15mm Diamond Porcelain Drill Pk. 1A unique product that requires no drill guide, minimal coolant and fast, easy waste ejection which allows for continuous multiple hole cutting. High grade exposed diamond for fast, smooth cutting. Excellent performance on cordless and corded drills. Should be dipped in water before drilling and every 5 seconds thereafter to ensure prolonged life. Suitable for very hard tiles, porcelain, ceramic, granite, marble, glass, slate and stone.