... machine, track lifting and lining machine, railway ballast tamper, railway bolt wrench, rail bender , rail gap adjuster, cutting disc, grinding ... of a very high reputation. JGB-20 typeEngine driven hook-head wrenchManualone,Applying scope It's suitable for installing & dismounting ... .8kw3,engine rev.: 3600r/min 4,rated thrust: 20KN5,top head QTY.: 26,working efficiency: ≤4sec/one piece7,weight; 219kg8 ...