Sockets in the Monster XXL 3/8” drive impact swivel socket sets feature 12” extension lengths, are made of chromoly forged steel for strength and safety, and finished with black oxide coating. Available in an 11-pc metric set (No. MST99777) and 10-pc SAE set (No. MST99789), tools in this set feature a 30-degree swivel head to provide more usable torque than universal joint designs. The pinless joint design prevents binding. These sockets are ideal for many hard-to-reach bolts in engine compartments or under the vehicle. The MST99777 11-pc metric set includes sizes 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18 and 19mm. The MST99789 10-pc SAE set includes sizes 6/16”, 3/8”, 7/16”, 1/2”, 9/16”, 5/8”, 11/16”, 3/4”, 13/16” and 7/8”. Both sets come with a lifetime warranty.