Pro-Shot Bore Mop 17 Caliber 5-40 Thread Cotton

Pro-Shot bore mops are 100 percent cotton with a brass core. They are made of the highest quality construction possible. Mops can be used for quick cleaning and bore lubrication. Mops are especially excellent when using oil for bore lubrication because they create foaming action that helps in the lubrication process. American Standard #5-40 thread.