Boehm 37mm Hollow Punch Cutter PEH121 140 Intermediate lead suitable for through Size:12 Intermediate lead suitable for through holes or blind holes where the thread does not need to go right to the bottom of the hole ergonic handle conforms complete to users hand providing the ability to generate up to 30 percent more torque blade type printed on top and on grip of handle for fast identification of screwdriver tip type anti roll handle design resists rolling on inclined or vibrating surfaces precision machined black tips ensures the screwdriver tip always fits easily and precisely into the screw head 15 year guarantee The hollow punch sets can be paired and inter changed very quickly and easily by using the patented lock in chuck system A paired set of punches can be used to cut washers or sealing rings