Features and Benefits:Sockets have 3/8" drive and are 12 pointAll Duo-Socket™ sockets are marked by both roll stamp and large laser etching on the opposite sideThe ratchet included is a 72 tooth quick releaseIncludes 3" and 6" straight extensionPackaged in blow molded caseThe thin wall design of chrome hand sockets are combined with the strength and durability of Grey Pneumatic impact sockets to create the Duo-Socket™. This 59 piece set is built specifically to address the needs of the professional technician using hand tools, cordless impact tools and air tools. The Duo-Socket™ provides one socket for all applications. This set includes the following: 72 tooth quick release ratchet, 3" and 6" straight extension and the socket sizes include: Standard and Deep: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1"; Standard and Deep Metric: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm.