PLATE SWIVEL CASTER: Rotate 360 degrees. Swivel caster wheels. Swivel casters rotate 360 degrees which makes turning the mating equipment possible. It’s good for transporting furnitures and displays quietly and safely. RIGID NON SWIVEL CASTER: This rigid caster has a top plate attachment with a rigid and wheel assembly which permits only straight-line movement. CASTER SIZE: Plate Size: 1.9” (49mm) x 2.7” (70mm). Hole center to hole center: 1.3” (35mm) x 2” (52mm). 0.33” (8.4mm) x 0.44” (11mm)). Overall Height: 2.7” (70mm). Caster Wheel Diameter: 2" (50mm). Caster Wheel Width: 0.9" (23mm). Capacity 150lbs each caster wheel. CASTER WHEEL: Made of Polyurethane. Caster Wheel Color: All Black. Premium Heavy Duty Caster Wheels are made of high quality polyurethane wheels with strong abrasion resistance, silent shock absorber, wearproof, no drag marks and enhance the impact resistance of the whole caster. Includes: 12 casters of 2 inch caster wheels - 6 no brake swivel wheels, 6 rigid fixed non swivel wheels.