3/8 in drive short sockets are made of chrome vanadium steel with nickel - chrome plated. The mouth of the sockets has a Super Drive® design that prolongs their life and does not damage the screws and nuts and bolts. This set features 21 sockets sizes: 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm. Meets National and International standards: American and European. Used for automotive and industrial maintenance and repair work for applications where a conventional socket is limited due to space constraints. There is an Urrea socket always ready for any challenge.