Krowne Metal 28-180S Extra Heavy-Duty Large Plate CastersDesigned for double stack convection ovens, these Krowne Metal 28 180S Casters have a heavy duty design. Capable of accommodating 600 pounds per caster load, their wheels are 6" in diameter and grease resistant. They withstand temperatures between 14F to 212F and raise equipment height by 7 1 4". They have 4 1 2" x 4 1 8" plates and come in sets of four per box. These 28 180S have two rigid casters adn two swivel. The swivel have brakes attached.