Diamond Drill Bit Set for Bottles, Pots, Marble, 5 Piece, 1/4'' Shank

NEIKO 00823A Diamond Hole Saw or also called diamond drill bits are designed to drill holes in glass, ceramics, porcelain, tile, ceramics, limestone, slate, marble, granite, stone, and fiberglass. This set comes with 5 of the most used sizes; 5/32'' (4mm), 1/4'' (6mm), 5/16'' (8mm), 3/8'' (10mm), and 1/2'' (12mm). These hole saws are made with alloy steel and have a slit on the side to help with entry of water and to cool your bit for a longer life. The slit is also used to remove any debris that may get stuck in the hole saw. Note: Please keep adding water to bit or surface that is being cut when in use to extend drill bits life. 5/32'' (4mm) 1/4'' (6mm) 5/16'' (8mm) 3/8'' (10mm) 1/2'' (12mm)