Premium Materials: The deep hole markers are made of premium metal and rubber materials, solid, accurate and practical. Comes with an integrated sharpener screwed to the top of the marker, the deep hole markers are always sharp for good accuracy, the gray lead is graphite, while the yellow and red lead are paraffin for durability and strength water.SCOPE OF APPLICATION: This pencil can be used on different surfaces such as metal, plastic, glass, wood, paper, concrete, drawing on dark surfaces with pencil leads yellow and red pencil is no longer a problem.Product Features: This carpenter pencil gives you a nice and non-slip writing feeling when you are working in woodworking. The 2.8mm diameter in combination with deep hole marking and the fine tip design allows the pencil to reach deep or narrow holes for marking and drawing. at the end of the wood penScope of delivery: you will receive 1 deep hole pencil and 24 refills (two boxes of gray graphite refills, one box of yellow paraffin refills, one box of red paraffin refills). The quantity is sufficient and thoughtful and will be your marking, drawing, DIY and woodworking.After-sales service: We provide 180-day warranty service for construction sites, encounter any problem in the process of use, please contact us, we will get back to you with a 100% satisfactory solution within 24 hours