The J Dewey Rods .20 Cal/.204 Cal #5-40 male bore brush is a precision-engineered cleaning tool designed for optimal maintenance of firearms with a .20 Cal or .204 Cal bore. This bore brush features a #5-40 male thread, ensuring compatibility with a wide range of cleaning rods and accessories. Constructed with high-quality materials, the brush provides durability and effective cleaning performance, removing fouling and debris from the bore to maintain accuracy and extend the lifespan of the firearm. The brush's bristles are specifically designed to offer a balance of stiffness and flexibility, allowing for thorough cleaning without damaging the bore surface. Ideal for both professional gunsmiths and firearm enthusiasts, the J Dewey Rods bore brush is an essential component of any comprehensive firearm maintenance kit. Constructed with high-durability nylon bristles and a robust brass core for enhanced performance and longevity 5-40 male thread specifications Extended length bore cleaning brush for rifles