Product Details DriveAlign? OE Exact Automatic Belt Tensioner by Gates. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit for a hassle-free installation, this reliable product can help you get your vehicle back on the road faster and easier. Specifications: Contact Surface: Smooth/Backside Material: Thermoplastic OE Comparison Rating: OE Exact Bearing Bore Inside Diameter 1: 17 mm Number Of Pulleys: 1 Outside Diameter: 2.56" Outside Diameter: 65 mm Pulley 1 Flanged: No Width: 25 mm Features: Comprehensive line includes parts to fit cars, vans, SUVs, and light trucks Full line coverage for import, domestic, and heavy-duty cars, trucks, and vehicle applications Patented labyrinth seal protects internal components to meet or exceed OE life expectancy requirements