NK 4-inch Hard Rubber Wheel Swivel Plate Casters with Brake, Set of 4 Features & Specifications: Feature: Side Brake Type: Swivel Caster Material: Hard Rubber Capacity: 300 lbs. Per Caster Quantity: Four (4) caster wheels Bolt Hole Pattern: 1-3/4" x 2-7/8" Top Plate: 2-1/2" x 3-5/8" Wheel Size: 4" Diameter 1-1/4" Width NK is a registered & protected trademark. Any authorized reproduction, resale, or misuse of trademark will result in a fine and punishable in the court of law.