Using this Klein Tools adjustable hole saw is easy. First, choose the right drill chuck size (it fits most 3/8 and 1/2 drill chucks). Then, adjust the saw blades to the desired hole diameter between 2 and 7 inches. When cutting drywall or ceiling tiles, hold the drill steady and let the saw do the work smoothly. Make sure not to apply too much pressure as it can cause the saw to bind. After use, clean the saw to remove any dust or debris. Store it in a dry place to prevent rust. Replace the dust shield if it gets damaged for continued good performance. And always keep the hex key in a safe place as it's used for some adjustments.