At-A-Glance "Checker" Fits In Your Shirt Pocket
Thin, lightweight, stainless steel gauge fits easily in your pocket and measures choke constriction on all .410, 28, 20, 16, 12, and 10 gauge shotgun barrels. Great for collectors, dealers and shooters that need a fast, visual verification of choke constriction.
Big Book Catalog, Issue:70, Page:474
SPECS: Stainless steel, bright polish. 5-1/8" (13cm) long.