This brass powder horn spout has a generous 3/8" pouring hole. The stopper has a "O" ring that creates a friction fit in the spout, holding it securely in place, waterproof.
A lanyard can be tied to the groove in the stopper to prevent loss in the field. Once installed in a horn, the spout and stopper extend the horn about 1-1/2". The knurled base is 0.500" OD to slip into a 1/2" hole in your powder horn neck. Glue it in place.
