The Kleen Bore Military Style Bore Brush .30/7.62mm Caliber AKB is a critical maintenance tool for military rifles. This Kleen-Bore Cleaning Kit can be used for M16, AR15, AK-47 and similar rifles, making it one of the most versatile bore brushes available. The Kleen Bore Military Style Brush features a core wire looped through a brass coupling that is threaded at 8-36. The chamber brush on the Military Style Bore Brush by Kleen Bore is configured with two diameters. This Kleen Bore bore brush has a first stage of phosphor bronze that cleans the chamber area, while the second stage of stainless steel cleans the bolTlock area. This Bore Brush by Kleen Bore is made from high quality Bronze and Steel to ensure a durable product that will last.