SincereetaliFeatures: 6-Point Design --- The 6-point socket design enlarges the contact surface between sockets and fasteners, strengthens locking force, reduces wear and prevents rounding at corners. Various Size --- Set includes 7 common metric sizes for impact sockets; 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm. Premium Quality --- Highly Cr-Mo steek with durable black oxide coating resists corrosion to eliminate the risk of rust for extended tool life. Customized Storage Case --- Designated slots in the case keep each piece in place and sockets do not fall out or slip. Sizes are also marked next to each slot for identification. Compatible With --- For use with 3/8 manual wrenches, electric air wrenches and Remove the inner torx screw. Specifications: Material: CR0 steel Size: H4/4mm, H5/5mm, H6/6mm, H7/7mm, H8/8mm, H10/10mm, H12/12mm Package Weight: 440g Package Size: 15 * 9 * 5cm / 5.9 * 3.5 * 2.0in Package List: 7 * Impact Socket 1 * Carrying Box