2.5" x 1" General Duty Polyolefin Swivel Casters With Side Brake(lot of 8pcs) Quantity: 4pcs Size: 2-1/2" Overall Height: 3-3/8" Plate size: 2-3/8 x 3-5/8" Bolt hole pattern: 1-3/4 x 3" Wheel Material: Polyolefin Wheel  Load Capacity: 150 lbs per caster (600 lbs for the set) Features: Bright Zinc plating