Track Union Bracket, Single Box Rail Splice, Max. Weight (Lb.) 450 lb, Steel, Bright Zinc Finish, Length (In.) 1 3/4 in, Height (In.) 3 5/16 in, Width (In.) 2 1/4 in, Depth (In.) 1 3/4 in, Joint Union Mounting, Steel, Hardware Not Included, For Use With Doors Weighing Up To 450 Pounds