Deep-hole machine: deep-hole carpenter pencil designed with an elongated and tapered tip 45mm in length that can reach hard-to-reach areas where other carpenter markers won't go, suitable for mark through holes or in other tight areas. Mechanical Pencil: Carpenter's pencils won't slip from fingers and repetitive drawing 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 masonry. Washable and co material Visible Marker: The pencil refills are made of wax, which is water soluble and can be wiped off 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 with the yellow and red carpenter's pencil refills. Built-in pencil sharpener for precise marks: the pencil sharpener is screwed into the top of the mechanical drawing pencils which won't get lost either, and your mechanical pencil will always