11pc Power Spling Bit Set is made of Chrome Vanadium Steel, Unit Packing: Blow mold case with color sleeve and shrink 11pc Power Spling Bit SetMaterial: Chrome Vanadium SteelContains:5pc-30mm Hex Bits: M5, M6, M8, M10, M125pc-75mm Hex Bits: M5, M6, M8, M10, M121pc-Bit Holder:1/2"Hex*1/2"SQ. DriveUnit Packing: Blow mold case with color sleeve and shrink 11pc Power Sapling Bit Set