Cranked double ring set for improved access to hard-to-reach fasteners. Tempered, forged chrome vanadium steel and high-quality, polished surface. Extra-solid nylon storage bag. Sizes: 6 x 7, 8 x 9, 10 x 11, 12 x 13, 14 x 15, 16 x 17, 18 x 19 and 20 x 22 mm