1、6-point Design --- 6-point socket design enlarges contact surface between sockets and fasteners, locks force more firmly, reduces wear and prevents rounding off at corners. 2、Variouse Size --- Set includes 7 common metric sizes for impact sockets; 4mm，5mm，6mm，7mm，8mm，10mm，12mm. 3、Superior Quality --- Highly Cr-Mo steek with High quality black oxide coating finish is corrosion resistant to eliminate chance of rust for a long lasting tool life. 4、Customized Storage Case --- Designated slots in the case keep every piece in place and sockets don\u0027t fall off and slip. Sizes are also stamped beside each slot for identification. 5、Compatible With --- For use with 3/8\" manual wrenches, pneumatic electric wrenches,and Remove inner torx screw. Features: 6-point Design --- 6-point socket design enlarges contact surface between sockets and fasteners, locks force more firmly, reduces wear and prevents rounding off at corners. Variouse Size --- Set includes 7 common metric sizes for impact sockets; 4mm，5mm，6mm，7mm，8mm，10mm，12mm. Superior Quality --- Highly Cr-Mo steek with High quality black oxide coating finish is corrosion resistant to eliminate chance of rust for a long lasting tool life. Customized Storage Case --- Designated slots in the case keep every piece in place and sockets don't fall off and slip. Sizes are also stamped beside each slot for identification. Compatible With --- For use with 3/8" manual wrenches, pneumatic electric wrenches,and Remove 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/15.5oz Package Size: 15*9*5cm/5.9*3.5*2.0in Package List: 7 * Impact Socket 1 * Carry Box 7 * Impact Socket 1 * Carry Box