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 socket, (1) 1/2" 17 mm socket, (1) 1/2" 19 mm socket, (1) 1/2" 22 mm socket, (1) 1/2" 24 mm socket. 38 mm length.