How To Use? The correct way to use these clamps is to ensure that there is not too much slack between the clamp and the hose. The clamps should fit snugly around the hose so that when the tool compresses the clamp will tighten evenly without any slack to the compression. Advantage They are stainless and so they won't rust and they don't leak. No burrs, no misshapen parts. All fit well and worked even better. Worked perfect for me to attach some fuel lines, air lines, vacuum and garden hose. Fit correctly, and they crimped nicely. The joints would not rotate, and were watertight.