The MILWAUKEE? SHOCKWAVE Impact Duty? 1/4"-1/2"Drive Adapter Set provides users with tool versatility. This adapter converts 1/4? drive tools to be used with 1/2? drive impact sockets and vice versa. 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.