Mounting screws are not included with the purchase of the Rubbermaid 3600-L4 Swivel Plate Caster.
If screws are not included with casters/caster sets we recommend using self-tapping screws. I've included a link to some screws you can use with this caster.
Thanks again for your question, and don't hesitate to contact Tundra Restaurant Supply with any more questions or concerns you may have.