[A worthwhile set]: The package contains 4 boxes of black pencil refills, 24 pieces in total. Use these refill pencils to make clear and precise markings for various purposes, helping you to better complete carpentry or construction work. [Waterproof material] These pencil refills are made of high-quality graphite, which has high hardness and strong stability. They are moisture-resistant and waterproof. Even heavy rain cannot wash away the marks. [Precise marking] The refill pencils measure 2.8mm in diameter and 150cm in length, which can easily reach small gaps or holes where other carpenter's markers cannot. They are excellent for deep hole marking. [Versatile] The solid carpenter's pencil refills can be used to draw on glass, ceramic tile, metal, wood, paper, and other surfaces. And they are perfectly suited for carpenter's pencils, mechanical pencils, pencils, carpenter's pencils, etc.</p> <p>[All-Purpose Construction Pencil] These pencil refills are widely used for woodworking, 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 relatives or friends.</p>