This premium quality key ring set comes with 12 pieces. The key rings are made of brass material and are a length of 3in. with a key ring diameter of 1in.. They have a quick release feature. Push In And Pull Out detachment assures it will not come apart unless you want it to. It works well with car keys to remove them from your other keys when you need to put them in the ignition. It can be used with Keys, Reels, ID"s, Badges, Access Control Cards, Whistles, Eyeglass Holders, or a variety of other items. Please see our other Key-ID-Badge accessories listings.