Premium Materials: The deep hole markers are made of premium metal rubber materials, solid, accurate practical. Comes with an integrated sharpener screwed to the top of the marker, the deep hole markers are always sharp f good accuracy, the gray lead is graphite, while the yellow red lead are paraffin f durability 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 red pencil is no longer a problem. Product Features: This carpenter pencil gives you a nice non-slip writing feeling when you are wking in woodwking. The 2.8mm diameter in combination with deep hole marking the fine tip design allows the pencil to reach deep narrow holes f marking drawing. at the end of the wood pen Scope of delivery: you will receive 1 deep hole pencil 24 refills (two boxes of gray graphite refills, one box of yellow paraffin refills, one box of red paraffin refills). The quantity is sufficient thoughtful will be your marking, drawing, DIY woodwking. After-sales service: We provide 180-day warranty service f construction sites, encounter any problem in the process of use, please contact us, we will get back to you with a satisfacty solution within 24 hours