Custom made "Barrel Gauges"----#1 will measure-- 10--12--16 Ga.----- #2 will measure 20--28 Ga.------ Up to 18" in length. Dial OR Digital types available. ALL parts are made in my home workshop. No Plastic Parts. NO floppy setting rings !! My setting fixture is "Piloted" for extreme accuracy !! These gauges have been purchased and used by----- PHIL KINER------WRIGHT'S CHOKES MERLIN'S TRAP GUNS KARL McKNIGHT GUNSMITH THE BARTHOLOW SHOOTING FAMILY GARY BONNETI-------RICH BULLARD GARY SHERROD------DENNIS DeVAULT IND. ---And Thanks To MANY Others.