"Insist on 6061-T6 drawn tubing for strength, durability, and precise fit. Extruded tubing looks similar but is not as strong or as durable. Extruded parts are prone to failure, while drawn parts keep performing. Drawn material offers the same strength as hex without the additional weight.• New black finish!• 6061-T6 aluminum-drawn tubing.• 7/8” O.D. has 5/8” -18 RH and LH threads."