Using this mini tubing cutter is easy. First, select the right size of the tube within the 3/16 - 1 - inch capacity. Place the tube in the cutter and adjust it properly. Then, turn the cutter around the tube to make a clean cut. Remember, it works well on copper, aluminum, and soft steel. When using it, make sure to hold it firmly to avoid any accidents. For maintenance, keep it dry to prevent corrosion. If the cutting wheel gets dull, you can easily replace it with the available SXT cutter wheel (Part 42135). This cutter is made to last, but proper care will ensure it serves you for a long time.