Deep-hole maker: the deep-hole carpenter pencil designed with extended and needle-nose tip of 45 mm in length, reaching hard-to-reach areas where other carpenter marker do not go, suitable for marking through holes or in other tight areas Package including: each woodworking marker has been pre-filled with a refill, comes with 3 refill boxes including 6 red refills, 6 yellow refills, and 6 gray refills (21 refills in total), that can meet your woodworking marking needs for a long-term Built-in sharpener for 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 be sharpened for nice precision Mechanical pencil: the carpenters pencil do not slip out of the fingers and repetitive tracings cause less pain; The pen clip design can be easily attached to the pocket, easy to use and not easy to lose, gaining in efficiency, proper for construction and bricklayers Marks on various surfaces: the solid carpenter pencil can draw on metal, plastic, glass, wood, paper and so on; The drafting pencil are reliable, which are grease to trace everywhere; Refills of 3 colors can distinguish marks with different meanings and can mark on dark surfaces