The 20-piece BRILLIANT TOOLS socket spanner set BT025020 is manufactured according to DIN. The entire set has a 3/4" (20 mm) square drive. It comes in a practical case with metal hinges and fasteners with moulded tool holders. The labels inside the case enable the right inserts to be found quickly. The extremely robust reversible ratchet has a right/left hand rotation with lever switch-over, a push-button for quick release of the sockets and a 24-teeth ratchet mechanism with a backswing angle