PartsW 4 Pc Suspension Kit for Jeep Cherokee Comanche Grand Cherokee Grand Wagoneer TJ Wagoneer Wrangler/Wrangler JK Upper & 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