Use with 3/8″ drive ratchets and extensions to reach recessed and hidden fasteners. Hardened and tempered, drop-forged chrome vanadium. Supplied in a plastic storage rack. Sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19mm. Use with 3/8″ drive ratchets and extensions to reach recessed and hidden fasteners. Hardened and tempered, drop-forged chrome vanadium. Supplied in a plastic storage rack. Sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19mm.