diamond core drill bit Brazed /laser welded Model TK-E Type Application:For drilling stone slab,porcelain,brick, concrete Diamond core ... or laser weldingBrazed or laser welded core bits Model:TK-E Type Application: For drilling stone slab, tile , porcelain , brick ,and concrete ... -1/2")9mm575mm76mm / (3")9mm575mm diamond core drill bit ,TK-E