... bladetips Produce about 10years Best quality and competive price Carbide tipped hole saw,drill bit 53mmIt is used for hole drilling on ... -off shaping of the automatical digit-controled grinder, the blade tips are of high precision, firmness and sharpness, ideal for easy ... /30mm/32mm/35mm/38mm/40mm 42mm/45mm/48mm/50mm/53mm Carbide tipped hole saw,drill bit 53mm,