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Pictures taken in kind, produced by the owner. All beef tendon lens opener(Turn on the lens pressure ring without teeth),Professional tool for removing fixed focus and some old lens pressure rings without openings to open the lens,Available lens diameter range:37-40MM43-46MM49-52MM55-58MM62-67MM72-77MM82-86MM.Our own CNC machine tools, if you need other sizes, please contact the store to order! Provide dimensions.