Magnetic underside ensures grip on all ferrous surfaces, such as tool trolleys, tool walls, machines, lifting platforms, and in metal drawers. HAZET SmartRail is developed and produced in Germany. It is easy to clean and features a durable, robust twist lock for a tight fit and instant access. More securely fixed when locked: turn the socket left to remove. It has a robust metal lug for hanging, such as on a hook. It includes 1/2" square sockets made in Germany. Drive: square, hollow 12.5 mm (1/2 inch). Output: outside hexagon traction profile. Wrench sizes: 10, 13, 17, 19, 22. Dimensions/length: 245 mm x 37.4 mm. For manual operation. Number of tools: 5.