SPECS: Phosphor bronze bristles, brass shank. Rifle - 8-32 tpi threads, except 5.56mm M16 rifle. 3¼" (8.3cm) OAL. 5.56mm M16 Rifle - 8-36 tpi threads to fit military cleaning rods only. Handgun - 8-32 tpi threads. 2-1/8" (5.4cm) OAL. Shotgun - 5/16-27 tpi threads. 2-7/8" (7.3cm) OAL.