You can cut a range of size holes in GLASS, TILES, SLATE, MARBLE ,GRANITE with ease!!! Diamond tiped hole ... saw (Core Bit)You can cut holes in GLASS, TILES, SLATE, MARBLE ,GRANITE with ease,A whole range ... INCLUDED Best used wetAfter using, clean & wipe down with oil to prevent rust. You CAN USE CORELESS DRILL AT A ... of metal packing box as below, Diamond Dust Tipped Glass cutting Hole Saws