TruGuard, 2 Pack, 1-5/8", Black, Dual Wheel Caster With U-Bracket, 55 LB Load Capacity, Good For Use On Carpeted Surfaces, Dual Wheels Place More Wheel Surface On Carpet, Wheels Move Independently In Opposite Directions To Maximize Maneuvrability, For Use On Ready To Assemble Furniture, Office Chairs, Printer Stands & Entertainment Centers, Attaches With Small Screws, Included In Package.