TLILY 10Pcs Dry Diamond Drill Bits Set,3/16Inch 1/4Inch 5/16Inch 3/8Inch 1/2Inch for Granite Ceramic Marble Glass,Not for Wood

Each diamond drill bit has a built-in wax lubricant, which can melt and cool the drill tip, prevent diamond loss and extend the life of the drill bit. You can cool the drill bit after each hole to maintain optimal performance. The package includes 2 pieces 3/16 inch (5 mm) drill bits, 2 pieces 1/4 inch (6 mm) drill bits, 2 pieces 5/16 inch (8 mm) drill bits, 2 pieces 3/8 inch (10 mm) drill bits and 2 pieces 1. 2 inch (12 mm) drill bits. The combinations and quantity of 10 pieces for your long-term use and replacement. The built-in round shank is compatible with most popular electric drills, angle grinders and bench drills. The side groove design removes debris faster and the depth marks on the side are convenient for precise operations. The dry diamond drill bit adopts vacuum brazed diamond technology to drill clean holes in various types of tile, ceramic, porcelain, glass, marble, stone, masonry (not suitable for wood). Product Name: Diamond Drill Bits Color: Black Material: Diamond