Product Info: - Part: Drive Belt Tensioner - Material: Plastic - Housing Material: Aluminum - Belt Type: Serpentine - Color: Black - Groove Quantity: 6 - Inside Diameter: 2.562 inches - Mounting Hole Diameter: 0.41 inches / 10.5 millimeters - Mounting Hole Quantity: 1 - Outside Diameter: 77.39 inches / 30.