I purchased this, believing it to be a genuine metal lens cap for a Rollei Rolleiflex 2.8, but it turned out not to fit my Rolleiflex 2.8A. There are signs of wear and tear from age, but it is still usable. For those who can appreciate it as a used item with age-related wear. Please refrain from purchasing if you are sensitive to the condition. It's a bayonet mount. I'm not sure how to use it, but I believe it's similar to other Rollei products. Please purchase only if you are knowledgeable about the product. (I will answer questions) It comes with a case that can be folded for storage (I'm not sure if it's genuine). ※Important Please review the product images and description before considering a purchase. Shipping is included. I am not planning to offer a discount. The triangular scale in the images is not included. Accessories, twin-lens reflex camera, metal cap, front cap, RolleiFlex, Rollei I am also selling other vintage camera accessories. - Type: Lens cap - Material: Metal cap - Color: Black - Storage case: Included - Logo: Rollei Thank you for looking.