Hand Punches are great for use on Leather, Perma or SunGlo. The #164G is a lightweight rotary punch for occasional use. For the best results, twist so tube blade will slice through material. The #164HD is a heavy-duty rotary punch. Frame is highly polished forged steel. Cutting tubes are hand-turned from special carbon tool steel and threaded for easy re-placement. The #164HD1, a 1-tube punch, is also heavy duty. It has a #8 tube (1/4”) that’s used for installing electronic devices that re-quire a larger hole.