Deep hole maker: The deep hole carpenter pencil designed with extended point and 45mm tip length, reaching hard to reach areas where other carpenter markers won't go, suitable for marking through holes or in other tight areas Built-in sharpener for precise marks: the sharpener is screwed into the top of mechanical drawing pencils, which also won't get lost and your pencil mechanics will always be sharp for beautiful precision Mechanical pencil: the carpenter's pencil does not slip out of the 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 masons Marks on various surfaces: the carpenter's pencil solid allows drawing on metal, plastic, glass, wood, paper; Drawing pencils are solid, they are grease to trace everywhere and more solid than hard; Yellow can draw on dark surfaces where gray does not draw