... : EASY TO USE GOOD QUANLITY hand screwdriver set:Manufacture and supply various full ... adapters, bit holders and quick changeconnectors for screwdriver bitsmaterial types:Cr-V 6150,8660,S2Surface treatment:sandblasted, tin-coating ... , Cu-coating, Ni-coating, Cr-coating, Zn-coatingHead types:PH, PZ, slot, Torx, square, hex, hex-plus ... with round neck,non-magnetic and magnetic hand screwdriver set