Housing with Fasteners Steel Silver Galvanized Finish Length (In.) 3 1/8 in Height (In.) 3 1/8 in Width (In.) 5/16 in Depth (In.) 6 7/16 in Wheel Diameter Not Applicable Roller Width/Dia. (In.) No Roller Surface Mounting Mounting Hole Size (In.) 9/32 in Number of Wheels 0 Steel Hardware Included For Use With Sectional Garage Door