This 400 Series swivel Light Duty caster with a Zinc finish features a 4" diameter wheel made of hard rubber and Plain bearings. It's 5" tall, has a 275 lb load capacity and a 3-7/16" swivel radius. It's mounted using a top plate mount with mount dimensions: 2-7/8" x 3-5/8" Bolt Hole 1-3/4" x 2-7/8"to 3".