YKK #10 Marine Zipper Boat Tops, Outdoor, Canvas. Heavy Duty. Big, Chunky, Large

Used in Marine, Auto, Boat, Tent, Recreation, Coats, Jackets, Snow Pants, and many many more uses. They are made in the USA, by YKK and UV Rated for the sunshine. A strong, top quality zipper! Large, Chunky, Heavy Duty. etc. I don't know how else to explain.