4 in

Red Polyurethane Swivel Plate Caster, 350 lb capacity, locking, heavy-duty, strong, and smooth-glide, Made in the USA

Commonly used on heavy industrial carts, assembly line fixtures, and mobile equipment that requires frequent repositioning under load

Well-suited for warehouses, fabrication shops, and production areas where carts need to move smoothly between stations and lock securely during use

Also i for demanding DIY or commercial builds where durable, high-capacity mobility is needed across rough or high-traffic workspaces