Nite IzeS-Biner Carabiner Size #4 Made of lightweight plastic, the two-in-one S-Biner by Nite Ize features a double-gated design that has the same functionality and same nearly endless variety of uses as a regular carabiner. Ultra-handy dual spring gates will hold, secure and connect everything from house keys and cell phone holsters to technical camping gear. Attach valuables to the center bar for ultimate security, link gate ends to a second set of items and anchor, or connect many items together. Medium sizes (#4-#6) connect everything from water bottles (to belt loops or backpacks), boots, skates, waders, sports gear, and garden gloves (to garage hooks and hanging straps), reusable grocery bags (to closet pegs and grab handles in your car). Identify at a glance while you organize - choose different colors to differentiate sets of keys, luggage, car fobs, ski passes, and all your other organized personal items.