The Milwaukee 3-Piece SHOCKWAVE Impact Hex Shank Socket Adapter Set is engineered for extreme durability and up to 30X life. The SHOCKWAVE Impact Duty Socket Adapters are made from proprietary steel and heat treated to control hardness. The optimized Shockzone absorbs peak torque and prevents breaking for secure fastening capabilities in all impacts. This tool set includes one 1/2 in. Socket Adapter, one 1/4 in. Socket Adapter and one 3/8 in. Socket Adapter.