GREY PNEUMATIC 1642RD 3/8" Dr. 42 Pc. Standard/Deep SAE/Metric Set - 12 Point Features and Benefits:Made of high quality steel (chrome-molybdenum)Engineered specifically for use with impact tools, using the most up to date industrial specificationsMade to transfer the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strengthComes a molded storage caseLifetime Warranty Each impact socket features high torque drives. This feature limits the amount of wear on the corners of the fastener and the socket. It also improves the strength of the socket, transfers increased torque to the fastener and allows easier access to tight areas. Each socket is thoroughly made with the correct balance of strength and durability and is tested to the highest specifications to deliver outstanding performance at the most competitive cost.Set includes: 8 pieces fractional standard sizes: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16" and 3/4"; 8 pieces fractional deep sizes: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16" and 3/4"; 12 pieces metric standard sizes: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm; 12 pieces metric deep sizes: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm. Also includes (1) universal joint and (1) 3" extension.