Clear and Obvious Color: our deep hole mechanical construction pencil replacements adopt silver ink, which can more clear and obvious to look when marking darker surfaces; Due to the pencil replacements are less erasable, you can also use them to mark a variety of surfaces with confidence Sufficient Quantity: you can get 60 pieces of 2.8 mm solid silver pencil refills in 10 boxes in each package, 6 pieces per box, sufficient quantity allows you to replace your carpenter mark pencils in time to make smooth and clear lines to avoid drawing again and again, improving your work efficiency; You can also share them with your colleagues Apply to Various Surfaces: pencil refills for carpenter mark pencils can be applied to various surfaces with its quality material and less erasable feature, including oily, rough, smooth, wet, dry, icy and rusted surfaces, suitable for construction, woodworking, architect drawing and so on, meeting most needs in your Work Without Worries: these mechanical pencil refills made of quality metal material are strong and sturdy, not break and fade easily during the woodworking, drawing or marking process; You can complete your work effortlessly without worrying about accidents at work Versatile Applications: our colored pencils refills have a wide range of application, befitting for scribe tool, carpenter pencil, carpenter tools, engraving tool, glass cutters, glass engraving and more, you can use your creativity to make more combinations for more functions