Part Specifications ——————-Nominal Tube Size 3.” Centerline Radius 4.5″ Bend Angle 45 degree Tube Thickness 16 gauge Tech Tip: The nominal size listed for oval tubing approximately equals the equivalent diameter for like-size round tubing. Eg. Nominal Size of 3″ = Actual Tube Size of 2.125″ x 3.5″. T34 Stainless Steel is a non-magnetic alloy that possesses very high chromium and nickel content, making it much more capable of withstanding acidic, high heat and corrosive conditions than regular (mild) steel.