... 150t crane use Single hook Materials: DG20 hook block150t single hooks strength grade: M, P, S, T, V ... DG34CrNiMo or DG30Cr2Ni2Mo, more than 40t with DG30Cr2Ni2Mo. Model:Single hook: 5t/6t/10t/12t/16t/20t/25t/32t/40t/50t ... /63t/80t/100t/125t/160t/200t/250tdouble hook: 10t/12t/16t/20t/25t/32t/40t/50t/63t/80t ...