This 21 piece socket set includes both 1/4″ and 3/8″ drive sizes, and comes in a durable plastic case. The set is designed for metric measurements and includes sockets in a range of sizes, fully heated for extra stregth. Distributed by Royce Union Co. and the manufacturer part number is S-0601-3. The set is in new old stock condition and has never been used. Perfect for automotive repairs or any DIY project, this socket set includes all the necessary tools for a variety of tasks. The surface finish is chrome, and the set weighs 2 lb. 8 oz. and was manufactured in Taiwan.This set is an excellent addition to any toolbox. Fast, free shipping.