Team Z Motorsports Double Adjustable Double Hiem Lower Control Arms for GM F-Body vehicles are designed to allow for maximum adjustments while being super simple to do. No taking the lowers out of the car to adjust! These control arms are constructed out of 1-3/8â€³ 4130 chromoly tubing, TIG welded, and come with high quality 4130 hiem joints with Kevlar/Nylon race. They are powder coated in a silver hammertone finish for corrosion resistance and quality appearance. Proudly made, assembled, and quality checked in Detroit, Michigan.