4 in

Black Polypropylene Swivel Plate Caster, 350 lb capacity, locking, high-capacity with secure braking, Made in the USA

Commonly used on heavy-duty carts, storage racks, and mobile workbenches that need to be moved frequently and then securely locked in place

Well-suited for workshops, warehouses, and backroom environments where equipment is regularly repositioned between tasks

Also i for DIY or commercial builds that require strong, stable mobility with reliable control during stationary use