The construction pencil lead does not slip from the fingers and repeated 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. This strong construction site pencil can be used on all kinds of surfaces, such as metal, plastic, glass, wood, paper and other materials. Yellow and red can be drawn on dark surfaces. The deep-hole carpenter pencils designed with an elongated tip and a 48mm tip length, reaching hard-to-reach areas where other markers do not fit, suitable for marking through holes or in other tight areas. And if you extend the lead you can even trace in 2.8 mm holes. The pencil lead of the carpenter's pencil marker can simply be replaced. After using the pencil sharpener, the pencil sharpener is screwed into the top of the mechanical drawing pencils, Normal storage will not take up much space or lose small items. The pencils for woodworking is pre-filled with black lead, comes with a refill box included 2 black leads, 2 red leads and 2 yellow leads which can meet your long-term wood marking needs.