GD52108 Diameter: 4" Features: -Pulley. -Heavy duty galvanized steel pulley with galvanized steel strap. -Case hardened steel race with steel ball bearings. -Factory lubricated. -Can be used at stationary or spring pulley positions. Specifications: -Diameter 3": 9.68"H x 3.81" W x 0.75" D. -Diameter 4": 11.56"H x 5.69" W x 1" D. -Dimensions: 9.68-11.56" H x 3.81-5.69" W x 0.75-1" D. gd52109 Installation gd52108 Installation