... in GLASS,TILES,SLATE,MARBLE, GRANITE,with ease!!! Diamond tiped hole saws (Core Bits)Engineered to cut holes in glass, tiles, ... can cut the following size holes 3mm,4,5,6,8,10,12,14,15,16,18,20,22,23 ... use a piece of wood with the same size hole in it as a guide,which can be held ... cm;weight:1.8kgs/setsizes in case:4mm,5,6,8,10,12,15,20,22,25,28,30, ... ,40,45,50,53,60mm Diamond dust tipped glass hole saws