Door Hanger Kit Sliding Door Box Rail Max Weight (Lb.) 450 lb Steel - Zinc Finish Length (In.) 4 1/2 in Height (In.) 10 5/16 in Width (In.) 1 9/16 in Depth (In.) - Max Wheel Dia (In.) - Roller Width/Dia (In.) No Roller - Mounting Mounting Hole Size (In.) - Steel Bearings Number of Wheels 4 Steel Hardware Included Requires - For Use With Doors Weighing Up To 450 Pounds Package Quantity 2