... gives smooth and fast drilling on stone slab, tile and porcelain with fast speed. Stone Diamond Core BitGMG series diamond ... core drill bit gives smooth and fast drilling on stone slab, tile and porcelain with fast speed. They are ... used for drilling holes of different diameters in stone or cutting out stone cylinders. DescriptionApplicationStone Slab, Tile, Porcelain, BrickMachine TypeHand ...