With a body made of high quality, lightweight aluminum, this ultra-handy accessory with its dual stainless steel spring gates will hold, secure, and connect everything like keys, water bottles, and gear. The dual independent gates allow for quick, convenient accessibility to your items. Smaller sized S-Biners are excellent for connecting items like keys and clipping to zippers, while larger sizes can be used for organizing the garage and hanging or carrying large items like sporting gear. The S-Biner size #4 is perfect for large sized tasks.