Garage Door Roller, Steel, Silver, Galvanized Finish, Shaft Length 3-7/8 in, Height (In.) 4 in, Width (In.) 7/16 in, Outside Dia. 1 7/8 in, Max. Wheel Dia. (In.) 1 7/8 in, Roller Width/Dia. (In.) No Roller, Surface Mounting, Mounting Hole Size (In.) 7/16 in, Steel Bearings, Number of Wheels 1, Steel, Hardware Not Included, Requires Needs Roller Hinge Fixture, For Use With Sectional Garage Door, 1 Pair