4130 Chromoly Round Steel Tube 1.25" x .375" x 36",x 36" 4130 Chromoly Round Steel Tube 1.25" x .375", It is widely used in the Aviation and Racing Industries because it has an excellent strength to weight ratio, it is very malleable and it is very easy to weld,4130 Alloy Steel Tubing is Cold Drawn and Seamless, 100% Satisfaction Guaranteed The best-selling product Fast, Free Shipping and Returns Activities continue to surprise again and again! .375" x 36" 4130 Chromoly Round Steel Tube 1.25" x.