NZKW Chromoly tube ASME 4130
This rollcage tube is match with MSNZ requirement
Main Rollbar 44.5 x 2.5mm
Other members of the principle structure including safety harness bar 38.1 x 2.5mm
Optional members more than 300mm in length 38.1 x 1.6mm
more information please check with Motorsport New Zealand