Double-ball race swivel casters have double braking feature to lock the swivel and prevent the wheel from rolling at the same time. Thermoplastic non-marking wheel protects floors and resists corrosion. 1 3/4in. x 2 7/8in. to 3in. bolt hole spacing. Top plate size: 2 3/4in. x 3 3/4in.. Capacity (lbs.): 275, Wheel Size (in.): 5 x 1 1/4, Bolt Hole Spacing: 1 3/4 x 2 7/8, Top Plate: 2 3/4 x 3 3/4, Wheel Type: Swivel total locking, Material: Thermoplastic, Includes (qty.): 1