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