These high quality Gyford Stand-Off System Barrels are machined from aircraft-grade aluminum. These will connect to a Stand-Off Cap/stud and are tapped thru for a 5/16-18 thread. You will also need 5/16-18 threaded installation hardware (sold separately) to attach these to the wall, various options are available depending on your wall surface. No safety guarantee is expressed or implied for any Gyford product or any installation. It is the responsibility of the installer and/or end user to ensure that the parts and materials used in any installation will meet the demands of their intended purpose. Typically ships within 5 business days.