2-Wheel Bracket Sliding Door Box Rail Max Weight (lb) 600 lb Steel Bright Zinc Finish Length (In.) 4 5/8 in Height (In.) 4 in Width (In.) 1 17/32 in Max Wheel Dia (In.) 2 1/8 in Ball Bearings Number of Wheels 4 Steel Hardware Included For Use With Doors Weighing Up To 600 Pounds