Using the Greenlee 1557SS is easy. First, make sure you've got the right punch for the job, as different punches have different capacities. You can operate it with a battery, hydraulic, or high - leverage ratchet driver. When you start punching, the self - centering feature will align the punch on the pilot hole, so you don't have to worry about precise alignment. Just position it and start punching. As it punches, the unique design will split the slugs, which makes removing them much easier. When it comes to maintenance, after each use, clean the punch and die to remove any debris. Check the draw studs and dies for signs of wear. If you notice any excessive wear or damage, replace the parts as needed. Remember, this product is designed for 745 punch units and 7308 punch kit, so always use it in the appropriate application.