Krowne Extra Heavy Duty Large Plate Caster, 4-1/2" x 4-1/8" plate, 6" diameter wheel, (2) rigid with no brake & (2) swivel with brake, temperature range of 14°F to 212°F, 600 lbs per caster load capacity, grease resistant, raises height of equipment 7-1/4", for double stack convection ovens (set of 4)