The Camburg upper arms are designed to improve the performance and durability of your truck's suspension. They feature a larger 1.25 uni-ball bearing, which increases wheel travel and provides greater strength under extreme conditions. The arms also incorporate a billet aluminum cover to protect the uni-ball from dirt and contaminants. With CAD/CAM engineering and precision manufacturing, these arms are made to strict standards. They correct camber and caster, eliminate weak factory ball-joints, and come with polyurethane frame pivot bushings with grease-able zerk fittings. The arms are made in the USA and designed for 1-3" of lift. They include uniball spacers for both aluminum and steel OEM knuckles. Please note that they are compatible with US model trucks only.