These stainless steel tubing clamps (worm clamps) are durable, reusable clamps that help ensure you have an airtight connection between the barb and tubing. These are a must when attaching gas line to any barbs. This size clamp will work on tubing up to 5/16" in diameter. A simple flat head screwdriver is all you need to tighten this clamp. 10 count.