Size Diamond drill bit–6/20/30/35/50/68, diamond height 10mm, total length 60 mm, M14 thread. Size Diamond chamfer bit :2 Inch (50mm), 46mm workable length, M14 Thread, Grit #80, total Length 55mm, Top Angle 60 degree. Machine –For use on angle grinders. Wide Application of drill bit –Worked great for porcelain tile, ceramics, bathroom tile, marble granite, stone, masonry, brick with ease, Using water could prolong the lifetime. Wide Application of chamfer bit–enlarge/shape/round the EXISTING HOLES. Reduce the risk of cracking with standard and large format tiles subjected to tension (ex tightened plumbing, led lights etc), Bevel Ease chamfers and stress relieves rough holes in glass, ceramic and porcelain tiles.