ITL 12 Piece Insulated 1/2in 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, 10, 13, 14, 15, 16, 17, 18, 19, and 21mm. 1 x 1/2in Reversible Ratchet. 1 x Extension Bar 127mm (5in).