The MILWAUKEE SHOCKWAVE Impact Duty 3/8" Drive to 1/4" Drive Socket Reducer provides tool versatility and durability in high torque applications. This adapter converts 3/8" drive tools to be used with 1/4" drive impact sockets. Milwaukee engineered these reducers 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 reducer attachment and removal. All SHOCKWAVE Impact Duty Socket Reducers meet ASME industry standards.