Widely Application: Upper control arm bolts fit for 1999-2019 Chevy Silverado 1500 2WD 4WD; 1999-2019 GMC Sierra 1500 2WD 4WD; 1999-2010 Chevy Silverado 2500 3500 NON-HD + 2500 3500 HD 2WD 4WD; 1999-2010 GMC Sierra 2500 3500 NON-HD + 2500 3500 HD 2WD 4WD Fit Perfectly: Allows for +/- 1.5 Degrees of Camber and Caster Adjustment, in 0.5 degree increments. Function: You will need this part if you are changing the upper control arm, easy to install Advantage: Allows vehicle to be restored to factory specifications; Allows the user to adjust the proper vertical angle for more precise steering and improved ride quality, solving excessive tire wear and steering issues. Cams and bolts provide precise camber, camber and toe adjustments to provide alignment for non-adjustable vehicles Material: camber/caster alignment cams made of high quality 304 stainless steel material, bolts made of high-grade 12.9 bolts, hardness and not easy to rust, providing long-lasting durability Fitment: 1999-2019 Chevy SILVERADO 1500 2WD 4WD 1999-2019 GMC SIERRA 1500 2WD 4WD 1999-2010 Chevy SILVERADO 2500 3500 NON-HD + 2500 3500 HD 2WD 4WD 1999-2010 GMC SIERRA 2500 3500 NON-HD + 2500 3500 HD 2WD 4WD Function: 1. These upper control arm alignment cams can prevents unwanted changes to alignment caused by off-road driving 2. Provide ± 1.5 Degrees of Camber and Caster Adjustment 3. Camber caster alignment tool can be restored to factory specifications Package Included: 8 x Camber/Caster Alignment Cams (Left and Right)-304 stainless steels 4x High-Grade 12.9 Bolts