RockTrix for Precision European - 4pc 1/2" Thick - 8x170 & 8x6.5" Flat Wheel Spacers - Fits many 8-lug Chevy Ford GMC Hummer Dodge (See Description for Specific Year & Models) - 8x165.1 8x170 Adapters [VERIFY FITMENT] Universal spacers for any 8x6.5" (8x165.1) or 8x170 bolt pattern vehicle. Before purchasing, make sure your bolt pattern is one of those two. [SPECIFICATIONS] Pack of 4. Thickness: 1/2" (12mm). Bolt Pattern: 8x6.5" (8x165.1) and 8x170. Hub Bore: 125mm [MANUFACTURING] CNC Machined to exact specifications from Aerospace Billet Aluminum. Undergoes anodizing process to prevent corrosion. [PRODUCT BENEFITS] Gives your vehicle a more aggressive stance. Improves handling characteristics and stability. Fixes brake caliper clearance issues. Increases tire clearance to allow installation of wider wheels and tires. [*** IMPORTANT ***] Extended wheel studs may be required. Buyers need to measure their OEM Stud prior to purchasing. We recommend your studs be at least 1.5" long in order to properly install this product. This may vary depending on what type of wheel you have installed. As always, sufficient thread engagement is required to properly secure the wheel to your vehicle.