This item is a hard to find ENGLISH SHOOTER WHISTLE/SHELL EXTRACTOR. The extractor is marked "12" for 12 gauge. These are a multi use tool for a hunter or gun enthusiast. It is a dual use item. The whistle was used to transmit commands to a hunting dog. The shell extractor was used for older shot guns that didn't have a mechanical shell extractor. Fired shells are hot and this device allow for hands free shell extraction. The chrome finish is in very good condition showing no signs of wear from long use. Opened, the whistle measures 3 1/8".