SHOCKWAVE Impact Duty Socket Adapter provides you with tool versatility. These adapters convert drive tools to be used with 1/4 in., 3/8 in. and 1/2 in. drive tools and 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 Milwaukee SHOCKWAVE Impact Duty Socket Adapters meet ASME industry standards.