This is an accessory carabiner designed to be printed on the Solidoodle 3D Printer. After printing, carefully bend the gate around to the inside of the carabiner. The bending plastic forms a simple spring mechanism which snaps the gate closed. Use it for camping, backpacking, climbing - just don't load it with more than 5 pounds or so. I've tested the gate to over 1000 cycles and it works great.