General description This Heavy Duty 4PC 1/2 Drive Impact Socket Extension Bar Set includes four extension bars of varying lengths, designed for use with impact sockets. The set is made from durable chrome vanadium steel, ensuring strength and longevity. Technical specifications Drive Size: 1/2 inch Extension Bar Sizes: 50mm, 75mm, 125mm, 250mm Material: Chrome Vanadium Steel Other information 1 Year Warranty Included