Get the same great Clenzoil® Field & Range™ product on 50 cal/12 guage pre-saturated, cotton-fiber patches! The Clenzoil® Field & Range™ Patch Kit is the ultimate “One-Step-Solution” for cleaning, lubricating, and protecting fine firearms. It is especially great for cleaning and rust-proofing the bore of muzzleloaders, rifles, and shotguns.