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, increases friction, not easy to slip, helps prevent cuts or scratches. 3. Cuts 4cm film leader for modern cameras or 10cm for vintage cameras, such as 3a, 3c, IIIf, IIIG, and all L39 screw mount cameras. Material: Made of stainless steel, durable and long lasting. Suggestion: Use with a utility knife for convenient operation. Operation Instructions: 1. Place the film leader into the tool, gently close the tool. Pull the film up and down to align it with the hole position, then press the tool tightly. 2. Use a utility knife with a pointed blade along the tool edge to smoothly trim the film. (Keep fingers well away from the cutting edge.) Package included: 1 x Film Leader Trimming Template (films and utility knife not included)