4 in

Gray Thermoplastic Rubber Swivel Plate Caster, 300 lb capacity, locking, heavy-duty, smooth, and secure, Made in the USA

Commonly used on heavy utility carts, industrial shelving, and mobile workbenches that need to handle frequent repositioning under load

Well-suited for warehouses, maintenance areas, and backroom operations where equipment must move smoothly between stations and then stay firmly in place

Also i for large DIY or shop builds where strong, stable mobility is needed for transporting tools, parts, or materials across hard flooring