Bore Tech BTAJ-30-00 Jag Proof Positive .30 Cal The Proof-Positive Jag is a brass-free alloy jag that is barrel safe, heavy duty, and chemically-resistant. Type: Jag Size: .30 Cal Quantity: 1 Length: 2.6" Material: Brass-Free Alloy Thread Pattern: 8-32 Protects: Brass, Nickel, Copper Suitable For: Firearms