Deep offset ring ends for access to recessed fasteners. Hardened and tempered, drop-forged chrome vanadium. High quality fully polished finish. Ultra-strong ballistic nylon storage roll. Includes sizes 6 x 7, 8 x 9, 10 x 11, 12 x 13, 14 x 15, and 16 x 17mm. Deep offset ring ends for access to recessed fasteners. Hardened and tempered, drop-forged chrome vanadium. High quality fully polished finish. Ultra-strong ballistic nylon storage roll. Includes sizes 6 x 7, 8 x 9, 10 x 11, 12 x 13, 14 x 15, and 16 x 17mm.