27 piece 3/8" drive 6 and 12 point metric standard and deep socket wrench tool set. 72-tooth ratchet requires only a 5 swing. Large quick-release button for easy operation. Sockets feature Surface Drive technology to virtually eliminate fastener rounding. Chrome Vanadium steel. Nickel chrome plated for long lasting protection. Includes 3/8" drive of the following: 6 point deep metric socket, quick release ratchet with polished handle, 3" extension, 6" extension, and the following sizes of 12 point standard metric sockets: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, and 13 mm. Plastic carrying case included.