Steel Tubing for Race Cars and Muscle Cars. NOTICE: Updated: 06/04/21 – Due to wide spread steel industry shortages, Round Steel Tubingis temporarily unavailable from S&W (except for 1-5/8″ diam. x .134″ wall EWS mild steel.) We apologize for any inconvenience this may cause and thank you for your understanding. Please call 1-800-523-3353 if you have any questions.