... chipping, 3 minimum material deformation 4 long life Diamond glass core drill bits are used to drill glass,ceramics, porcelain, ceramic, ... no tremor, no broken edge, high wear-resistance,high efficiency, long service life.Diameter: 5mm - 100mm.General Total length: 55mm, ... Thickness: 0.8mm-1mmAll these drill bits can be customized.This is the diamond drill bit we are producing: Other abrasive products ...