.17 Caliber Brass Jag - Male Threaded J Dewey Manufacturing has been supplying Sportsman, Law Enforcement, Competitors and Collectors with the highest quality gun cleaning supplies in the industry since 1975. Description: .17 Caliber Brass Jag - Male Threaded All Brass Construction with Pointed Tip 5/40 Male Threads For Use with J. Dewey .17 and .20 Caliber Cleaning Rods, and Any Cleaning Rods with 5/40 Female Threads