... material deformation 4 long life Diamond glass core drill bits are used to drill glass,ceramics, porcelain, ceramic, porcelain tile, limestone, ... high efficiency, long service life.Diameter: 5mm - 100mm.General Total length: 55mm, 65mm, 70mm,75mm,90mm,95mmService life: can dig ... Thickness: 0.8mm-1mmAll these drill bits can be customized.This is the diamond drill bit we are producing: Other abrasive ...