1The head is of the special process technology, high hardness and small incision resistance 2The surface is of painted and full grinding processing with anti-rust treatment which is smooth to drill. 3Single threaded U-type chip discharge groove make it smoother to drill. 4The design of triangular handle make it more fastening to clamp and not easy to slip. 5Widely used in ceramic tile, glass, brick wall, wood, etc.
