Features: 1Impact Resistance: The sleeve is designed to prevent rounding of nuts and bolts under high torsion performance as well as impact stress through impact wrenches or electric wrenches etc. 2Tool Steel Material: The sleeve is made of hard and wear resistant tool steel which has good corrosion resistance and is very durable. 3Main Purpose: This sleeve provides high strength and flexibility to handle high torsion impact tools making it very useful. 4Heavy Duty Storage Case: This set comes with a storage case for easy storage and use of the sleeve and is easy to carry. 5Wide Application: This sleeve is suitable for the construction industry manufacturing industry home repair auto repair industry etc. Specification: Item Type: Drive Socket SetMaterial: Tool steelSpecification: 1/2in press fitSleeve Model: H5 H6 H7 H8 H10 H12 H14 H16 H17 H18 H19 H22Weight: Approx. 1550g / 54.7oz Package List: 12 x Drive Socket Set1 x Storage Box