These rust proof extra large giant 1 1/4" key rings are super strong, super high quality and are what we've been using as components in Specialist ID (SPID) Products for years! The benefits of heat treated steel are increased strength, hardness, toughness, and wear resistance. Making them much harder to bend or break. This process basically alters the micro-structure of the steel by exposing the steel to high temperature for a certain period and then quenching it (rapidly cool). The product is nickel plated after the treatment to provide corrosion resistance. An attractive silver tone color is added for a classy and shiny appearance, making this bulk item a great value for your money! <BR> <p> Perfect for product use, these keyrings can securely attach to your carabiner or lanyards to hold many items from keys to tools and more. They are also useful in a craft business as great accessories for decorative keychains. Popular to loop through a bottle opener, usb flash drive, portable charger, small flashlight or compass. Strong enough to use as a potted plant hanger, wind chime or hummingbird feeder hanger. Innovative with replacing a broken plastic fastener, broken zipper pull tab, securing your measuring spoons together better, adding extra length to hold straps together or saving closet space by slipping over the neck of a hanger to add a second hanger on the ring or make your own hook and ring bar game! So many useful ideas for crafts... Add a decorative toggle, use as napkin ring holders, make your own key fob, sensory book, toy fidget gadgets, restroom key holder, leather keychain, dog collar tag. <BR> <p> For military or police work, easily clips to gear and accessories or to include in your edc bug out bag or tactical tool box. Can attach to hooks, badge reels or belt loop clip carabiners or to carry portable multi-tools, id badges, nursing flashcards, rental home property keychains and more.