The snap hook multi adaptor is a great way to add function to your push button swivel bases. It is easy to install and use, and it fits all standard push button swivel bases. To use the snap hook multi adaptor, simply depress the plunger with the supplied Allen wrench and slide the adaptor into the base. The adaptor will then convert your push button base to accept a snap style hook. This is a great way to add versatility to your firearms and make them more adaptable to your needs. For example, you could use the snap hook multi adaptor to attach a sling, bipod, or flashlight to your firearm. The set includes (2) snap hook multi adaptors and two stainless steel bases. This gives you plenty of adaptors to use on all of your firearms.