An essential screw extractor set in 3/8"D and 1/2"D formats 3/8"D sizes: 2, 3, 4, 5, 6mm x 38mm long.1/2"D sizes: 8, 10, 12, 14mm x 44mm long. Sockets can be used with standard ratchet or with either a 17mm or 22mm spanner. Manufactured from alloy steel.