... ,GRANITE with ease!!! a set of 20 new diamond tiped hole saws (Core Bits)with case.You can cut the following ... , 6mm, 8mm,10mm,12mm, 15mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 45mm ,50mm 55mm, 60mm. ENGINEERED TO CUT ... PERSONALY USE A PIECE OF WOOD WITH THE SAME SIZE HOLE IN IT AS A GUIDE , WHICH CAN BE HELD OR ... A SPRAY BOTTLE FOR WATER. Diamond Tipped tile stone glass Hole Saw