The SPC xAxis Sealed Fle Joint reduces compliance, increases angularity, and improves durability vs rubber bushings and other aftermarket options. This variant of the xAxis has an aluminum outer shell making it a material fit for any aluminum control arm application. Built to accept a 10mm bolt and go into a 40mm bracket,the joint will push into a 1.750" end ring. The xAxis joint is built to upgrade the bushings on SPC Audi arms, but can be used in the custom build of your choice. California Residents WARNING