4 Pack Swivel Stem Caster with 3" Hard Rubber Wheel 1.2" Tall Threaded Stem Heavy Duty Rotate 360 degrees. Smooth & Silent & Sturdy. HEAVY DUTY Capacity: 250lbs each. M12 - 12mm threaded stem. 1.2" (30mm) threaded stem length Wheel Dia.: 3" (76mm). Wheel Width: 0.85" (23mm). Wheel Material: Rubber Overall Height: 3.6" (90mm). Color: Black. Ball bearings: Double ball bearings Includes: 4 (3" Stem Caster)