You will receive 4 pcs of 304 stainless steel swivel caster with brake wheels. Top Plate Dimension: 4-1/2'' X 3'. Hole Position: 3-1/4'' X 2-3/4'. 304 stainless steel caster wheels are perfect for wet environments, kitchens, food service industries, pharmaceutical labs, hospitals, or any clean room that requires stainless steel casters to prevent rust and corrosion.