These billet spacers are a must-have for car enthusiasts and professionals alike! The Hub Centric Billet Spacers are made from T6 Grade Billet Aluminum and carry a 5mm thickness, perfect for those looking to close the gap on their 5X100 / 5X112 Bolt Patterns. With a 57.1mm Center Bore (Without Lip) and a Machined Finish, the set of two is aesthetically sleek and visually appealing. The hub centric design has addressed the wheel balance issues that arise from using generic spacers. Installing the spacers was easy due to its perfect fit and alignment, subsequently making the driving experience smooth as ever. The precise fit ensured the wheels didn't wobble even at high speeds, ensuring a safer drive. The T6 grade aluminum construction is durable and holds up to wear and tear as you embark on numerous on and off-road adventures. The hub-centric design of the spacers allowed for an evenly distributed car weight with less burden on the bolts or studs. Overall, the Hub Centric Billet Spacers by Topline Products have exceeded all expectations. They're well-built, easy to install, and works as advertised. They're a great addition to any vehicle and a must-have for anyone seeking to give their ride a more aggressive stance. I rate this product a solid five stars out of five!