ISO standard square / circle / heavy tanks (SEG / REG / HEG) 1.SEG160 meet ISO-6020/2 specifications, using four rod structure design, versatility, has the advantage of low friction high life with the American company Parker HMI cylinders compatible. 2.REG160 comply with ISO-6020/1 standard, front cover to steel screws attached to the flange plate, front and rear flange plate and the cylinder with threaded connections, combined with tight, easy removal with the U.S. firm MMB Parker cylinder compatibility. 3.HEG250 meet ISO-6022 and DIN-24333 specifications, front cover to steel screws attached to the flange plate, front and rear flange plate and the cylinder with threaded connections, combined with tight, easy removal with Germany Rexroth Corporation CDH2 cylinder compliant.