... The material of screw \barrel and hardness: 38CrMoAlA steel nit riding, HV8401.4 The controller of the ... off roll :1300mm,the surface of the initiative steel roller plate hard chrome and machining polish, the open ... off controlled by air control, the up-take-off roller adopt the excellent robber , anti-chap and shed ... winding-up5.2 The width of the wrap-up roller: 1300mm5.3 Two air shaft for winding suit ...