Rotopax’s unique design adds strength and provides extra tightening power. Use with included base plate or remove plate to attach mount direct by bolting up through the bottom or down through the top. Lock your Rotopax fuel pack or storage box. Unique design provides extra tightening power for ultimate security. (We do not carry spare keys. We recommend storing one of the 2 included keys in a safe place) Please note sometimes the actual lock can get stuck if it exposed to the weather and elements. This is not unique to this product- most metal materials will rust when outside. We recommend an occasional spray with graphite or other spray lubricant (PB Blaster works great) into the lock to prevent it from rusting. Comes with a 1 year warranty.