1.material:carbon steel,Cr-V and Cr-Mo 2. ... bits sockets set02-583-01 11pcs bit sockets set(1/4")◊11pcs-1/4"Dr.bit sockets:PH1,2,3,PZ1,2,3 ... -metal shelf02-583-02 9pcs bit sockets set(1/4")◊9pcs-1/4"Dr.bit sockets:T10,15,20,27,30,40 ... 03 5pcs bit sockets set(3/8")◊5pcs-3/8"Dr.bit sockets:T25,30,40,45,50mm◊1pc-metal ... -583-04 5pcs bit sockets set(3/8")◊4pcs-1/2"Dr.bit sockets:T40,45,55,70mm◊1pc-metal shelf ...