PartsW 4 Piece Front Suspension Kit for Cadillac Chevrolet GMC/Escalade, Avalanche 1500, Express 1500/2500, Silverado 1500, Tahoe, Savana 1500/2500, Sierra 1500, Yukon/Upper and Lower Ball Joints Undergo impact, wear, and fatigue testing to help ensure quality and durability Advanced corrosion protection against the harshest conditions / Precision-made performance and additional strength Designed with PREMIUM quality materials for exceptional performance, reliability and peace of mind Dust boot is re-installed and permanently attached to reduce contamination, and increase durability and service life Premium alloy steel stud for strength and durability / Replacement improves handling and noise