20 mm (3/4″) square drive. Chromium-vanadium steel. Chrome-plated. Knurled. With securing pinContents:1 lever-action reversible ratchet (50 teeth)1 hex socket bit ea. in AF 22, 24, 27, 30, 32, 36, 38, 41, 46, 50 mm1 handle with sliding collar1 extension ea. in 200, 400 mm