Product Description Safe support during pin removal.Embedded magnet holds pins.Universal hole sizes/locations.Non-slip outer ring.Non-marring materials. Keep your Barrels Steady The inner groove holds your barrel in place keeping your barrel stabel while you work. Capture Pins Under The Block The outer ring has an embedded magnet to help make capturing pins easy after they are punched through the block. Won’t Mar Your Guns The soft and stable material won’t scuff, mar, or scratch the finish of your favorite gun.