Fit and Go 3/3 Double Socket Head/Double Ring End Ratchet Set - 18 Pieces comprises eighteen pieces. 6 mm to 7 mm double offset ring wrench, 2M-6-7 8 mm to 9 mm double offset ring wrench, 2M-8-9 Double offset ring wrench, 2M-10-11, 10 mm to 11 mm Double offset ring wrench, 2M-12-13, 12 mm to 13 mm Double offset ring wrench, 2M-14-15, 14 mm to 15 mm Double offset ring wrench, 2M-16-17, 16 mm to 17 mm Double offset ring wrench, 2M-18-19, 18–19 mm Double offset ring wrench, 2M-20-22, 20 mm to 22 mm Double offset ring wrench, 2M-21-23, 21 mm to 23 mm Double offset ring wrench, 2M-24-27, 24 mm to 27 mm Double offset ring wrench, 2M-30-32, 30 mm