This is the HAKUBA Film Picker 4. It's a tool for extracting the film leader (tongue) of 35mm film that has accidentally been wound into the cartridge. By inserting the two plates into the cartridge and winding, you can pinch the film leader and pull it out. It's an essential item for home developing and in cases where you've accidentally rewound the film. Made in Japan by Hakuba Photo Industry Co., Ltd. This item has been stored at home for a long time.