Deep Hole Machine: Cobee deep hole carpenter's pencil designed with an elongated, tapered tip of 45mm length that can reach hard-to-reach areas where other carpenter's markers won't go, suitable for marking through holes or other tight areas. Mechanical Pencil: Cobee carpenter's pencils won't slip out of fingers and repetitive tracing causes less pain. The pen clip design can be easily attached to the pocket, easy to use and not easy to lose, gaining efficiency, suitable for construction and masons. Washable Material & Visible Color: The pencil refills are made of wax, which is water soluble and can be wiped with a damp cloth when you mark badly or make the original place more beautiful and traceless. Drawing on a dark surface is no longer a problem thanks to the yellow and red carpenter pencil refills. Built-in Pencil Sharpener for Precise Marks: The Cobee pencil sharpener is screwed into the top of mechanical drawing pencils which also won't get lost and your mechanical pencil will always be sharpened for fine precision. Thoughtful Design: These mechanical pencils will give you a comfortable and non-slip writing experience when woodworking. There are grooves on the pencil body to increase friction when holding the pencil, which can reduce the pain of your hand by long-time work. Long and thin tip design allows the pencil to reach deep place or narrow hole for marking and drawing.