Allows the gunsmith or shooter to accurately measure extractor/shell rim tension to help achieve reliable case feeding, extraction and ejection. Place the double-ended gauge between the breech face and the extractor. Hook your 6 lb. trigger pull gauge through the Tension Gauge's hole and gently pull until the Gauge releases from the extractor. The trigger pull gauge shows exact amount of rim tension. SPECS: EDM brass. 2' (5cm) long. Set includes two
double-ended gauges to fit 9mm/.38 Super, .40, 10mm/.45 ACP for
most semi-auto pistols with exposed extractors and open breech
faces.