These ITL12 Piece Inch Drive Socket Set's are fully insulated and exceeds international standards. They have a lifetime guarantee on the tool and insulation, and are supplied in a case. 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 -40F to +158F, -40C to +70C. Set Contains: 6 x Metric Sockets: 8, 10, 13, 17, 19 and 20mm. 4 x Imperial Sockets: 3/8, 1/2, 3/4 and 7/8in AF. 1