The KAK Bolt Catch Roll Pin Starter Punch, also known as Walt's Tool", is sized just right to hold your bolt catch roll pin steady without scratching your lower. This durable Starter Punch features 304 Stainless Steel construction and has a simple and easy design. Notes:All roll pins are different before compressing, if they are a little loose in the tool, use a dab of grease in the pocket to hold it tight. If it's a little tight, don't worry, the hole int he lower is tighter. It will release once started in the lower. Once The pin is started, use your normal punch to drive it home.