PVC Adapter Stem Swivel Caster Wheels with Single / double Axle
Buy 3-1/2" Expanding Adapter Caster, 3-1/2" x 1-1/4" Thread Width, 250# capacity, 3-1/4" swivel radius | Shiffler - Furniture, Fixtures and Equipment for Schools
Amazon.com: Service Caster - 2 Inch Swivel Thermoplastic Rubber Caster Set of 4-1" Expanding Adapter Stems - Includes 2 with Side Lock Brake : Industrial & Scientific
1-1/2" Round Expandable Adapter Kit (ADP7615) | The Caster Guy