Hems are folded-back again edges on sheet metal elements, that may be opened or shut. In some cases, joining two hems also acts as fasteners. Bend sheet metal with making certain the subsequent conditions; The mechanical synchronization system is created up of components which include torsion, swing arm, and joint bearings. https://deangwflr.dsiblogger.com/64895018/a-secret-weapon-for-hydraulic-bending-press-tools