Large Format Film Developing Reels are designed to securely hold sheet film during the development process, preventing shifting, movement, or detachment. Compatible with various film sizes, including 4×5 inch, 5×7 inch, and 8×10 inch sheet films. Made from durable, chemical-resistant plastic, these reels ensure your film stays in place. The usage is straightforward: insert the film, secure it with the locking ring, and load it into the developing tank. Package includes one developing reel, available in sizes for 4×5, 5×7, or 8×10 film.