Bore Tech BTBR-30-003 Rifle Brushes Brass 30 Cal Bore Tech's Rifle Brass Brushes have twice the amount of phosphorous bronze (brass) bristles for doubling the scrubbing action. The core is cold-welded to the brass coupler and the bristles are filled to the end. Type: Brush Size: 30 Cal Quantity: 3 Pack Bristle Type: Brass Length: 2.5" Material: Brass Thread Pattern: 8-32 Suitable For: Firearms