Pulley Strap and Bolt, Granite, Silver, Galvanized Finish, Cable Size 3/16 in, Length (In.) 3 in, Height (In.) 1/2 in, Width (In.) 3 in, Depth (In.) 3 in, Outside Dia. 3 in, Wheel Diameter 3 in, Max. Wheel Dia. (In.) 3 in, Roller Width/Dia. (In.) 3 in, Surface Mounting, Steel Bearings, Number of Wheels 1, Steel, Hardware Included, For Use With Sectional Garage Door