The ITL 13 Piece Insulated 3/8in Drive Socket Set. The tools in this set are manufactured from injection moulded nylon thermoplastic, and are 100% tested to IEC60900, Category C and ASTMF1505. They are designed to withstand extreme impact, abrasion, and are flame retardant. ITL tools are 100% tested using 1000 volts for 3 minutes submerged in water. They are Category C Impact Tested for operation within a greater temperature range -40ºF to 158ºF, -40ºC to 70ºC. Supplied in a case, contains: 10 x Metric Sockets: 8, 9, 10, 11, 13, 17, 18, 19, 20 and 22mm. 1 x 3/8in Reversible Ratchet. 1 x Extension Bar 127mm (5in). 1 x Extension Bar 250mm (10in).