| 1 3/4" OD x .118" mild steel or .083" 4130 chrome moly from the links to the rollbars
"Designed for Solo, Autocross and high-speed Time Trials Meets SCCA and most race organization rules Typically made of 1.750" × .120" mild steel - 2.00" × .120" ERW tubing is used for cars exceeding 3500 pounds (DOM tubing available as an option for an additional $35) 4-Point mounting with welded diagonal cross brace Grade 5 mounting hardware and backup plates included" so it DOES meet the NHRA standards
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