Product Info: - Part: Drive Belt Tensioner Assembly - Material: Steel - Belt Type: Serpentine - Mount Hole Quantity: 1 - Pulley Center Bore Diameter: 0.405 inches - Pulley Center Bore Diameter: 10.30 millimeters - Pulley Outside Diameter: 3.0 inches - Pulley Outside Diameter: 76.2 millimeters - Pulley Width: 1.