*Deep hole manufacturer: the deep hole carpenter pen, which is designed with extended and needle nose tip of 45mm in length and reaches hard-to-reach areas where other carpentry markers do not go, suitable for marking through holes or other tight areas.
*Built in Sharpener for Marking The pencil sharpener screws into the top of the mechanical drawing pencils, which also won't get lost and your mechanical pencil will be sharpened for nice precision.