The Pro-Shot Choke and Chamber Tool is a quality made all brass tool that should be used with a Pro-Shot Payne Galway Chamber Cleaning Brush (not included) in chambers and the screw in choke area. Works for chambers including 410 bore, 20 gauge, 16 gauge, 12 gauge and 10 gauge. For Semi Auto Shotguns please use Chamber Tool VPN CH12 or CH20. Recommended for use with a Pro-Shot Payne Galway Chamber Cleaning Brush (not included).