4 Pack - 4" Swivel Caster Wheels Rubber Base with Top Plate & Bearing Heavy Duty Rotate 360 degrees. Smooth & Silent & Sturdy. HEAVY DUTY Capacity: 350lbs each. Plate Size: , 3.1" (80mm) x 3.9" (100mm). Hole center to hole center: 2.1" (55mm) x 2.9"( 75mm) Mounting hole dimensions: 0.33" (8.4mm) x 0.56" (14.3mm). Wheel Dia.: 4" (101mm). Wheel Width: 1.2" (30mm) Wheel Material: Rubber. Overall Height: 4.9" (125mm). Color: Black Ball bearings: Double ball bearings. Includes: 4 pack 4" no brake caster