Adjustable Door Guide, 1 to 3 3/4 in Doors, Steel, Bright Zinc Finish, Length (In.) 5 1/2 in, Height (In.) 4 in, Width (In.) 4 in, Roller Width/Dia. (In.) 2-1/2, Steel, Hardware Included, For Use With 450 lb, 600 lb and 1000 lb Steel Track