Graduations show the barrel diameter of any barrel or choke from 410 bore to 10 gauge. Measures 3-1/4" long with key ring hole. Marked in inches (.22"-.80"), millimeters (5.5-11mm) and gauge (410 - 10). Stainless steel.
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Galazan Bore Gage 10 Gauge to 410 Bore Stainless Steel