1 SMALL ARMS CLEANING BRUSH .50 CALIBER. SPIRAL TAPERED ROUND RATCHET END COPPER BRUSH. OVERLALL LENGTH IS 6.197″ INCHES. SINGLE BRUSH LENGTH OF BRUSH PART IS 3.750″ INCHES. BRUSH DIAMETER IS 0.749 – 0.763″ INCHES. CAGE # 79901. 1005-00-766-0915. MFG 2000-2015.