This socket set by Craftsman® features a black oxide finish for corrosion resistance and large markings to help you quickly identify the sockets you are looking for. Also, the 6-point socket design allows for increased torque due to a larger contact surface. Sockets meet or exceed ASME specifications. This set includes 12 deep sockets: 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 21 mm, 22 mm, 24 mm, and 27 mm. This product is backed by the Craftsman® full lifetime warranty.