The case has four rubber stoppers on the bottom, so it does not slip when placed on the workbench. The case has metal hinges and is lockable. Set consists of: Sockets 1/4": 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13 Sockets 1/2": 10, 12, 13, 14, 15, 16, 17, 18, 19, 21, 24, 27, 30, 32 Deep sockets 1/4": 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 Spark plug sockets 1/2": 16, 21 Combination spanners: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 Swivel head spanners: 8/9, 10/11, 12/13, 14/15, 17/19 Bit set 31-piece Adapter for bits 1/4" and 1/2" ratchet 1/4" spinner handle 1/4" and 1/2" universal joint Extension 1/4" 75mm and 150mm Extension 1/2" 250mm and 125mm Plastic case