Garage Door Roller, Plastic, Black, Plastic Finish, Shaft Length 3-1/2 in, Length (In.) 3 1/2 in, Height (In.) 3 1/2 in, Width (In.) 1 7/8 in, Depth (In.) 1 7/8 in, Outside Dia. 1 7/8 in, Wheel Diameter 1 7/8 in, Max. Wheel Dia. (In.) 1 7/8 in, Roller Width/Dia. (In.) No Roller, Surface Mounting, Mounting Hole Size (In.) 15/32 in, Number of Wheels 1, Steel Shaft/High Impact Plastic Wheel, Hardware Not Included, Requires Hardware, For Use With Sectional Garage Door, 1 Pair