1.58 piece clamp kit 2.Material  :Heat treated 45# steel black oxide finish 3.Hardness:studs 25°,nut and step clamps step block 35-38° 4.Usage:Applyfor fixing each kind of working-piece on machining  table. 5.Threads reach to 6H standards 6.Triangle block from material of 45# steel 7.Basket material from of Plastic-steel For(M8—M12) Basket material from of iron for M14, M16 8.Set in plastic rack or wooden plateconsists of: 24pcs studs（75、100、125、150、175、200mm） 6pcs T-nuts,4pcs coupling nuts 6pcs flange nuts 6pcs step clamps 6pcs step blocks