Made of high quality, weather-resistant stainless steel, this ultra-handy accessory with its dual spring gates will hold, secure and connect everything from keys to water bottles to gear. Smaller-sized S-Biners are excellent for connecting two zipper sliders on backpacks, duffels and suitcases. We know that one size doesn't fit all, so we have designed six different sizes so you can choose the right size for the task at hand. We have found that the smaller sizes work great for hanging smaller items from a purse or backpack strap, attaching to individual keys or hanging a plant from a ceiling hook. The larger sizes work great for bigger jobs like hanging a paint can from a ladder or a tool to your tool belt.