Suspension Control Arm Shaft Kit. We can offer this because our parts are engineered, tested, re-tested, and subject to strict quality control procedures - our quality is second to none. BUILT FOR PROFESSIONALS. Theres a reason why the most well-respected performance suspension brands use Proforged control arm shafts - were fanatical about quality, performance, and durability. Professionals save time and money with our products that outlast inferior brands. Do the job with confidence - replace your worn components with the leader in performance control arm shafts: Proforged. BUY WITH CONFIDENCE. Theres a reason that the most well-respected performance suspension manufacturers buy from Proforged: were the only brand of chassis parts that offers race-day performance. About Proforged: Our products are designed using CAD programs and are validated through hardness testing, microstructure analysis, surface finish examination, and roundness testing.