The ½” Diamond Drill Bit is an ideal accessory for drilling through ceramic, terracotta, porcelain, marble or granite tiles. It features a multi-layered sintered diamond tip for longer life and a large, angled extraction port for easy material slug ejection. Reverse spiral threads maintain efficiency and performance by delivering water to the drilling location. The versatile hex shank allows for use with driver-drills and hammer driver-drills, in rotation-mode only. For maximum performance, use with the Makita Dressing Stone (E-11754, sold separately).