6.3 mm (1/4″) square drive. Socket bits and tools made of CV steel. Ratchet made of chromium-molybdenum-vanadium steel with socket-locking function and push-button release. Matt chrome-platedContents:1 lever-action reversible ratchet (72 teeth)1 hex socket bit ea. in AF 5, 5.5, 6, 7, 8, 10, 11, 12, 13 mm1 extension with freewheel sleeve, 150 mm1 wobble