High-quality material: the SORAKO impact wrench nut set is made of chrome molybdenum steel with a corrosion-resistant black oxide paint for a long service life and is coated with a phosphorus coating so that it does not rust. Multi specification: the power impact wrench set contains the following nuts: 10, 11.12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 mm. The length of the extension rod is 5.10 inches. This should be enough for most situations. Hexagonal design: this professional socket set with round hexagon sockets is particularly robust. The hexagonal reinforced inner wall construction increases the contact surface between the key and nut to increase friction and reduce wear. Professional storage case: the cut-outs on the top and bottom of the case keep each part in place and no nut flies around. For faster recognition of nut size, sizes are embossed next to each slot. Package contents: 14-piece SORAKO impact wrench set, 1 x extension rod, 1 x L bar, 1 x case. If you have any questions, please feel free to contact us.