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.