1 PACK OF 10 SMALL ARMS CLEANING BRUSH .38 /.357 CALIBER / 9mm /.380 AUTO. MFG BY MILL ROSE CORPORATION IN THE U.S.A. L1 SPIRAL ROUND THREADED END COPPER BRUSH. OVERLALL LENGTH IS 2.312″ INCHES. THREAD LENGTH 0.312″ INCHES. SINGLE BRUSH LENGTH OF BRUSH PART IS 1.344″ INCHES. BRUSH DIAMETER IS 0.380″ INCHES. THREAD SIZE AND SERIES TYPE 0.164-32 UNC. THREAD CLASS IS 2A. CAGE # 79901. 1005-00-716-2132. MFG 2000-2010.