Open and bi-hexagonal ends with 15° offset for greater access. Hardened and tempered, drop-forged chrome vanadium. High quality fully polished finish. Ultra-strong ballistic nylon storage roll. Includes sizes 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 22 and 24mm. Open and bi-hexagonal ends with 15° offset for greater access. Hardened and tempered, drop-forged chrome vanadium. High quality fully polished finish. Ultra-strong ballistic nylon storage roll. Includes sizes 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 22 and 24mm.