Compatibility : 1999-2006 Silverado 1500, 1999-2006 Sierra 1500, 2000-2006 Tahoe, 2000-2006 Suburban 1500, 2002-2006 Avalanche 1500, 2000-2006 Yukon, 2000-2006 Yukon XL 1500, 2002-2006 Escalade Premium Ball Joints : Just like the joint of the human body. Ball joints provide pivoting movement between the steering knuckles and control arms, provide a safe, smooth ride and allow you to precisely control your vehicle. Dust cover prevent automotive fluids and road grime. give control arms longer service life. Before installation, It's necessary to grease the ball joint on the control arms Safety Guaranteed : Tig welding can reduce bubbles and prevent components from rupture. Full - length welding provides better stability and enhanced structure, which greatly guarantees the safety of driving Premium Material : Made of 36mm thickness high-strength steel,This control arm is superior to most product of its kind on the market. High-density Rubber bushing improve the performance and handling characteristics, transfer noise and vibration,improve the performance and handling characteristics Coated studs and steel control arms : FLYCLE front upper control arms can offer better stable and reinforced structure FLYCLE Front Upper Control Arms 2-4" Lift for Silverado 1500 Sierra 1500 Tahoe , 2 PCS Blue Tubular Suspension Control Arm for 1999-2006 Silverado 1500 Sierra 1500,2000-2006 Tahoe Suburban Yukon