Diamond Handy Puncher EP-19 strong enough for punches through steel up to 6 mm thick (stainless steel up to 5 mm). The most powerful punching action produces a burr free, round or elliptical hole far faster and most popular puncher with a throat depth of 55mm.The resulting hydraulic is very large, some hardened textured materials with this tool include iron and stainless steel. Suitable for channel bars as well as flat and angle bars. Max round hole diameter is 20mm and 14 x 21 mm for elliptical holes is possible.