4 Wheel Heavy Duty Trolley Assembly Roller for Barn Doors or Shed Sliding Doors, Compatible with 1-5/8" Wide or All 1-5/8" or Taller Strut Channel (4 Packs)

4 Wheel Heavy Duty Trolley Assembly Roller for Barn Doors or Shed Sliding Doors, Compatible with 1-5/8" Wide or All 1-5/8" or Taller Strut Channel (4 Packs)