Milwaukee Shockwave Impact Duty socket adapters are engineered for extreme durability and up to 10x life. Shockwave Impact Duty socket adapters are made from proprietary steel and heat treated to control hardness. What's Included: (1) 1/2" Socket Adapter, (1) 1/4" Socket Adapter, & (1) 3/8" Socket AdapterGeometric design provides the shock absorptionProprietary steel and heat treat process for maximum strength and durabilityCustom Alloy 76 steel maximizes resistance to wear and shockCustom alloy76 steel maximizes resistance to wear and shock1/4 in. Hex input driveExtreme durabilityImpact rated10X longer life