These Surface Mount Clamps are designed for use only with tables that have portable frames. These clamps work on both 2” and 2 3/8” outside diameter metal frames. These clamps allow you to have peace of mind that your portable table will stay put, even if you aren’t around to watch it. This helps prevent vandalism and theft, ensuring that your table is unable to be carried, knocked over, or otherwise vandalized. The clamps do not include bolts when purchased, but it is recommended that you use heavy lag bolts for added protection. Your installer may choose to use their own personal preference when installing these surface mount clamps. Each order comes with two clamps to ensure that your picnic and seating areas remain safe and intact. Be advised that these clamps are only for use with portable style tables and benches.