37/40mm Heavy Duty Phosphor Bronze Bore Brush or 100% Cotton Bore Mop SHIPS FREE
37mm/40mm Heavy Duty Phosphor Bronze Bore Brush. Phosphor Bronze Bore Brush. or 100% Cotton Bore Mop. 37mm/40mm Heavy Duty100% Cotton Bore Mop is ideal for applying solvent or lubricants to the bore, #5/16-27 Thread.