The Swiss-Designed and Engineered Kraftwerk Magnetic Rail Socket Set 3/8" is made from Chromium-Vanadium Quality Steel and has a lifetime warranty.Sockets: 11 Piece Hexagon deep sockets 64 mm long socketsRail: Lightweight and compact aluminium Magnetic. no screws required Corrosion-resistant Can combine your individual socket composition Sockets 1/4". 3/8". 1/2" can be combined on same rail 240 mm long rail
