Product Info: Part: Drive Belt Tensioner Material: Aluminum/Steel Belt Type: Serpentine Color: Natural/Black Mount Hole Diameter: 0.51 inches / 12.84 millimeters Pulley Outside Diameter: 3.0 inches / 76.2 millimeters Pulley Width: 1.24 inches / 31.51 millimeters Degree Range Of Adjustment: 36 Mount Hole Quantity: 4 Pulley Center Bore Diameter: 0.