Quick-Check Choke Gauge
Choke constrictions are mysteries until they are verified. Markings on shotguns are not always reliable - a previous owner may have even had them honed out. You can determine your exact constriction in 10 - .410 ga. shotguns with this tool. Simply insert it into the end of the barrel and take a reading off of the engraved scale.
Stainless steel construction.