... - 12 pulley, 3- use on overhead, gantry cranes and all kinds hoist, Crane hookdouble hook for overhead crane, gantry crane, or hoist etc use.1- Capacity ... gradeMaterials:M grade with DG20, or DG20MnP grade with DG20MnS grade with DG34CrMoT grade below 40t with DG34CrMo, more than 40t with DG34CrNiMo or DG30Cr2Ni2MoV ...