[A Worthwhile Set]: The package includes 4 boxes black pencil refills, total 24 pieces. Use these pencil refills to make clear and precise marks for different purposes, helping you do carpentry or construction work more efficiently. [Waterproof Material] These pencil lead refills are made of high-quality graphite, which has high hardness and strong stability. They are moisture-proof, waterproof. Even heavy rain can not wash away the traces. [Precise marking] The pencil refills measure 2.8mm in diameter, and 120cm in length, which can easily reach small gaps or drill holes where other carpenter marker can not. They work great for deep-hole marking. [Versatile] The solid carpenter pencil refills can be draw on glass, ceramic tile, metal, wood, paper and other more surface. Our pencil lead refills are compatible with Tracer Pencils and Pica pencils, joiner pencils, carpenter pencils, mechanical pencils, etc. [All-purpose Construction Pencil] These pencil refill are widely used for woodworking, building construction, artistic creation, etc. With the attached storage boxes, these work pencil refills are easy to store. It is also a wonderful gift choice for your farther or friends.