Features: 1. Unfold and bend outward design: easy to open, can be opened with one hand. 2. Open hole design: reduces weight and can be used for hanging; Easy to hold in the hand, increases friction, not easy to slip and cut/scratch the hand. 3. Cutting 4cm film leader for modern camera or 10cm for Leica vintage camera. For example: like Leica 3a, 3c, iiif, iiig... ... all L39 screw mount cameras. Material: Made of stainless steel, durable and long life. Suggestion: Use with utility knife, convenient for operation. Operation Instructions: 1. Place the film leader into the tool, gently close the tool. Next, pull the film up and down to align the film with the hole position, and then press the tool tightly. 2. Use a utility knife pointed blade to follow the tool edge, smoothly trim the film. (keeping your fingers well away from the edge that you'll be trimming along.) Package included: 1x Film Leader Trimming Template (The films and utility knife not included)