... core drill bits are used to drill glass,ceramics, porcelain, ceramic, porcelain tile, limestone, slate, marble, granite, stone, and fiberglass, ... as following:1, Metal bond abrasive products2, Resin and ceramic abrasive products3, Electroplated abrasive products4, Mounted points All products ... above can be customized. thin wall diamond core drill bit with threaded shankfor glass