- Perforation positioning: The carpenter's pencil allows precise perforation positioning. The 5mm longhole mechanical pencil body enables better positioning of the small hole gaps. - Built-in pencil sharpener: Unscrew the screw cap counterclockwise to reveal the mechanical pencil sharpener, which is convenient and can be used to sharpen the marker pen anytime and anywhere. - Pencil leads in three colours: Three different colours of mechanical pencil leads make marking easier, reduce confusion, improve efficiency, and minimize repeated marking. - Easy to use: The marker pen is suitable for various materials such as paper, wood, metal, and plastic. The non-slip design helps prevent slipping. The clip lets you hang it on your shirt when busy, reducing the risk of losing it. Use scenarios: - Precisely position and punch or drill holes in wood projects by aligning with the 5mm longhole mechanical pencil body. - Mark alignment points on metal or plastic parts before cutting or assembling to ensure accuracy. - Keep the tool handy on site by clipping it to your shirt, allowing quick marking on paper, wood, metal, or plastic as needed.