Free choiceWhen the casters set of 4 is delivered to you, the valve stem is separated from the wheels for furniture. You can install different valve stems (5/16 valve stem or choose rotating top plate) according to your personal needs. You can also choose not to install it and weld it directly to the bottom of the device. Multiple choices, free collocation, the decision is in your hands. High load-bearing capacityThe maximum load-bearing capacity of 2-inch polyurethane rubber caster wheels(1000LBS), the body structure of the wheel is made of high-quality nylon plastic, with compression-resistant elasticity, effectively reducing impact and improving load-bearing capacity. The surface of the tire has a polyurethane rubber coating, which can effectively protect the floor from scratches and leaving marks. Wide applicationNote: The exposed valve stem size of the heavy duty caster wheels is (5/16"), Not recommended as replacement chair casters unless chair socket is 5/16 diameter.The scope of application of industrial casters includes but is not limited to: shelves, shopping baskets, cribs, toddlers Ideal stem casters for cars, furniture, racks, file cabinets, tables, hangers, filing cabinets, machinery, etc. Simple installationSelect a valve stem you need, press it into the swivel casters and make sure it is stable, and insert it into the equipment to be installed to complete the installation. Of course, you can also replace the screw valve stem prepared by yourself and install it according to the above steps. Believe me, this will not waste a lot of your time, it only takes you 5 minutes. Products includedYou will receive 4X caster wheel, (Includes hardware for two attachment options: 4 x 5/16" diameter stems with 4 x 3/8" grip neck sleeves and 4 x 1-1/2" by 1-1/2" swivel top plate stem with 16 screws for mounting)Important: If you encounter problems during installation, please see the installation instructions shown in the picture, or the installation video below, or please contact us directly. Customer satisfaction is what we have been pursuing.