Insulated hand tools from Jameson provide maximum electrical protection. They are suitable for working live or close to live parts at nominal voltages up to 1,000-Volt. The 19-Piece Insulated Socket Set is ideal for use in a wide variety of utility, electrical, and telecommunication applications. Includes 1 tool case, one 1/2 in. drive ratchet wrench, one 5 in. extension, one 10 in. extension, 8 metric sockets measuring 8 mm, 10 mm, 13 mm, 17 mm, 19 mm, 20 mm, 22 mm and 25 mm, and 8 imperial sockets measuring 3/8 in., 7/16 in., 1/2 in., 9/16 in., 3/4 in., 7/8 in., 15/16 in. and 1 in.