This Low Profile Series swivel Specialty caster with a Zinc finish features a 3" diameter wheel made of nylon glass filled and Roller bearings. It's 4-1/32" tall, has a 1000 lb load capacity and a 2-7/16" swivel radius. It's mounted using a top plate mount with mount dimensions: 3-1/8" x 4-1/8" Bolt Hole 2-3/8" x 3-3/8" .