This complete kit includes (1) set of UMI Performance adjustable lower control arms and (1) set of fixed length non-adjustable upper control arms. These direct bolt-on replacements are designed to minimize wheel hop, improve cornering while lowering ET's and help track consistency. Lower Control arms are constructed DOM mild steel tubing 1.500 OD x 0.120 wall, 4130 chrome-moly threaded tube adaptor, completely CNC machined and fully TIG welded for outstanding strength. The spherical rod end allows for a bind free operation, making a great upgrade for both your track and auto cross driven vehicle, while the polyurethane bushings are designed to be bolted to the chassis of the vehicle for a quiet comfortable operation. The upper control arms feature 0.250 mild steel mounting points, 1.625 x 0.120 DOM steel tubing and polyurethane bushings. Both upper and lower control arms feature Energy Suspension® polyurethane bushings, zinc plated steel sleeves and on-car grease able zerk grease fittings. Adjustments can be made using the high quality QA1® Teflon lined spherical rod end that operates for a quiet bind free performance. Our lower control arms feature reinforced spring perches and heavy duty sway bar mounting points.