... material deformation 4 long life Diamond glass core drill bits are used to drill glass,ceramics, porcelain, ceramic, porcelain tile, limestone ... cooling water, high precision, sharp grinding , low noise, no tremor, no broken edge, high wear-resistance,high efficiency, long service life ... Thickness: 0.8mm-1mmAll these drill bits can be customized.This is the diamond drill bit we are producing: Other ...