Torsion Spring, Max. Weight (Lb.) 265 lb, Diecast, Silver, Diecast Finish, Length (In.) 4 1/2 in, Height (In.) 1 17/32 in, Width (In.) 4 1/2 in, Depth (In.) 4 1/2 in, Inside Dia. 1 in, Outside Dia. 4 1/2 in, Wheel Diameter 4 1/2 in, Max. Wheel Dia. (In.) 4 1/2 in, Roller Width/Dia. (In.) No Roller, Surface Mounting, Mounting Hole Size (In.) 1 in, Number of Wheels 0, Diecast, Hardware Included, For Use With Sectional Garage Door