Flexible plastic plug-in rail with 1/2" square sockets. Durable, robust twist lock for a tight fit and instant access. A magnetic underside ensures grip on all ferrous surfaces and also includes a robust metal lug for hanging. Includes: (Qty.) (1) 1/2" 13 mm long socket, (1) 1/2" 17 mm long socket, (1) 1/2" 19 mm long socket, (1) 1/2" 22 mm long socket, (1) 1/2" 24 mm long socket. 85 mm length.