The MILWAUKEE? SHOCKWAVE Impact Duty? 3/8? Drive to 1/2? Drive Socket Adapter provides tool versatility and durability in high torque applications. This adapter converts 3/8? drive tools to be used with 1/2? drive impact sockets. Milwaukee engineered these adapters with forged steel for durability in high torque applications. The laser-etched size markings allow for easy size identification. The dual-hole design and ring groove make for easy adapter attachment and removal. All SHOCKWAVE Impact Duty? Socket Adapters meet ASME industry standards.