4 Pack 3 Inch Caster Wheels Swivel Plate with Stem on Red Polyurethane Wheels 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: 1.25" (32mm). Wheel Material: Polyurethane Overall Height: 4" (101mm). Color: Red. Ball bearings: Double ball bearings Includes: 4 (3" Stem Caster)