This 1400 Series rigid Medium Duty caster with a Zinc finish features a 6 diameter wheel made of phenolic and Roller bearings. It's 7-1/2 tall, has a 900 lb load capacity and a n/a swivel radius. It's mounted using a top plate mount with mount dimensions: 3-7/8 x 4-1/2 Bolt Hole 2-5/8 to 3x 3 to 3-5/8 .