1. Size: about 11.4x1.7 cm/piece 2. Weight: about 16g/piece 3. Material: alloy steel + ABS plastic 4. Functions: watch repair, change battery, remove watch bottom cover, etc. 5. How to use: Put the prying knife in the special prying opening and tilt it outwards. 6. Method to prevent slipping: Wrap the watch with a piece of cotton cloth to prevent slipping in your hands. You can also put a piece of tape on the edge of the knife to prevent slipping. The tape can also prevent slipping. 7. Tip: It is mainly suitable for opening the back cover of a flat-bottomed press-in watch (the main feature of the press-in back cover is that the surface of the back cover is flat, and there is a small notch on the case on the edge of the back cover) 8. Note: only the back cover with a pry opening can be opened, and the back cover cannot be opened if there is none