... GLASS,TILES,SLATE,MARBLE, GRANITE,with ease!!! Diamond tiped hole saws (Core Bits)Engineered to cut holes in glass, tiles, slate ... the following size holes 3mm,4,5,6,8,10,12,14,15,16,18,20,22,23,25,28,30 ... :1.8kgs/setsizes in case:4mm,5,6,8,10,12,15,20,22,25,28,30,32,35, 38,40 ...