Fabtechs Uniball Upper Control Arms are designed to replace the factory ball joint arms to strengthen the front suspension for aggressive offroad use. The tubular Upper Control Arms feature 1.25 OD, .120 wall thick chromoly tube construction with 1 diameter Stainless Steel Uniballs that attach to the factory spindle without drilling. These Uniball Upper Control Arms have been designed to work in conjunction with the stock suspension, or as an add - on to Fabtechs 2 and 6 systems.