Using this 1-1/4 inch internal PVC pipe cutter is easy. First, attach it to a 3/8 inch or larger standard or cordless drill through the 5/16 inch quick - release hex shank. Then, place the cutter inside the 1-1/4 inch or larger PVC, CPVC, or ABS pipe. Start the drill, and it will cut the pipe from the inside out. When using it, make sure the drill is in good working condition. Also, wear safety goggles to protect your eyes. To keep the cutter in good shape, clean it after each use. If the blade gets dull, you can buy a replacement blade (Part 47520) separately.