Craftsman Hex Socket Set 3/8" Drive 5 Pc Piece Bit Allen Key Metric MM Chrome 3/8" Drive 5 Piece Hex Bit Metric Set Includes: 4, 5, 6, 7, 8 mm Nickel Chrome Plating Resists Corrosion and Simplifies Cleaning Heat treated Vanadium Steel For Uniform Hardness and Strength Rugged Alloyed Steel Build Stands up to Heavy Torquing Solid Design helps Eliminate Slip and Stripping