Designed to replace the OE Jeep TJ and JK front lower control arm bushing, the xAxis is recommended for recreational heavy use or off - road competition. The xAxis is packaged in the familiar JKTJ dimensions but uses a larger through hole to accomodate 58 or 16mm bolt. SPC's xAxis Sealed Flex Joint reduces compliance, increases angularity, and improves durability vs rubber bushings and other aftermarket options. California Residents WARNING