Specifications: Set Sizes Include: 29mm – 30mm – 31mm – 32mm – 33mm – 34mm – 35mm – 36mm – & 38mm All by 1/2″ Drive Each Socket Has A Drilled Head To Locate Retaining Ball Bearing On Most Breaker Bars & Impact Wrenches To Ensure A Safe Secure Fit FOR True IMPACT For Exceptional Strength & Durability Description: .