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 Œ, 5/16, 3/8, 7/16, œ, 9/16, 5/8, 11/16, Ÿ 13/16 and 7/8.