[Features]● The unique tip shape improves the biting ability to metal. ●By adopting a 2-stage blade, chip discharge is smooth. ●Nails do not get caught and can be cut safely. ●Composite materials and stacked boards can be penetrated in one shot. ●By using a guide bar, the center hole does not become large, and the siding using galvalume steel plate can be drilled cleanly and safely. ● Kosoku steel (HSS) drill has a guide bar to prevent runout.