General description The Irwin Glass & Tile Drill Bit Set is designed for drilling through glass, porcelain, and ceramics. This set includes five drill bits with diameters of 4mm, 5mm, 6mm, 8mm, and 10mm, making it versatile for various applications. Technical specifications Set includes drill bits of 4mm, 5mm, 6mm, 8mm, and 10mm Recommended RPM: 300 Installation Do not use on hammer setting Usage Drill with low RPM (300 RPM recommended) Water cooling is recommended during use Other information