... core drill bits are used to drill glass,ceramics, porcelain, ceramic, porcelain tile, limestone, slate, marble, granite, stone, and fiberglass, etc.Technology: Taking high quality ... Thickness: 0.8mm-1mmAll these drill bits can be customized.This is the diamond drill bit we are producing: Other abrasive ... products above can be customized. thin wall diamond core drill bit with threaded shankfor glass