Long product life. Less effort due to simple application - punching waste pieces are split and can be easily removed. Suitable for stainless steel (V2A), sheet steel (St37), plastic and aluminum. Hydraulic operation. Pre-drill diameter 12.7 mm 50344102 for tension screw diameter 11.1 mm, pre-drill diameter 20.5 mm 50344030 for tension screw diameter 19.0 mm.