Designed for plumbing and electrical installations, this 20 mm diamond core drill creates clean, perfectly sized holes for drain lines and conduit in dense porcelain and stone. It features vacuum-brazed diamonds for fast, dry cutting and an M14 thread for a direct fit on angle grinders. An integrated wax coolant reduces friction and heat, which prolongs the bit's life. This tool provides a reliable way to create accurate penetrations without causing chipping or damage.