Large Artillery Cleaning Brush: Looks to be for some kind of cannon/tank barrel. NSN# 1015-01-296-0875. Box says brush, cleaning artillery. July 93. This is a large brush that has approx 3/4 thread with a condensed plastic with bristles. Measures appox 7 1/2 long. New, with carrying bag that is rubberized waterproof material with a drawstring top. Ideal for collectors or display.