... " 4.5" 6" 8" 3.Length: max can reach 3.5m 4.Material: No.45 steel TJ-ISO1 inflatable shaftUsage:This type of ... off-axle apperance uniform expansion, thereby lock nitrogen-treated barrel,3. When unloading, press on deflated mouth to deflated, then nitrogen ... , it has advantages of convenient operation,quick, air shaft has big stress area, the stress distribution uniformity etc. Parameter: Winding drum ...