Designed and manufactured by Rubicon Ryder, 30+ years a Tool & Die Shop owner, in North Carolina. This sizer mounts directly to the Rugged Gear Cart as seen in the pictures. It may also be mounted on wooden and other style gun carts. This sizer, while not cheap, is an unbelievably necessary accessory whether or not you reload shotshells. Many reloads will try to "go back to their previous state" and open at the crimp, or bulge some, making them useless in a side by side shotgun. This tool, on your cart, makes it VERY easy to ensure that EVERY shotshell in your belt will gauge and load and shuck out of your gun! Once you have it you'll wonder how you ever lived without it.