About this project [Package Contents] 4 boxes of Carpenter mechanical pencil refills include 24 black HB graphite refills (refills only). Sufficient quantity will meet your marking, drawing, and carpentry needs. [Clear Marking] Drawing on dark surfaces is no longer a problem. You can choose according to the color of the surface you are drawing on, making your sketches more readable. [High-Quality Material] These woodworking pencil leads are made of high-quality wax and HB graphite. It is durable, strong, and long-lasting, with double-layered sticker protection during writing, it will not break easily. [Thoughtful Design] The refill diameter is 2.8mm and the length is 12cm. They are suitable for long deep holes. The pen can reach into deep places or narrow holes for easy marking and drawing, giving you a comfortable writing experience during woodworking. [WIDE RANGE OF APPLICATIONS] These deep hole mechanical pencil refills can easily mark the surface of wood, metal, plastic, paper, and other materials, which can greatly improve work efficiency. Marks and writes on all surfaces including dusty, rough, oily wet and dark surfaces.