Do away with the thread adapter; Special Line brushes thread right onto Dewey Coated rods. Eliminates the need to constantly change adapters; no more hunting for a misplaced adapter. Special Line brushes have the best phosphor bronze wire bristles for long life and thorough cleaning. A one-piece, looped and wound, brass shank and coupler prevents any chance of putting a scratch in that all-important barrel. Mfg: Brownells SPECS: Bristles: Phosphor bronze. Shank: Brass, looped and wound. Rifle: 3½ (8.5cm) OAL. Pistol: 2-3⁄8 (6cm) OAL. Calibers .22 to 6.5mm have 8-36 female threads. Calibers .270 to .50BMG have 12-28 female threads.