Premium Materials: The deep hole markers are made of high-quality metal and rubber materials, providing durability, precision, and practicality. Equipped with an integrated sharpener attached to the top of the marker, the deep hole markers stay sharp for accurate marking. The gray lead is graphite, while the yellow and red leads are paraffin-based for enhanced strength and durability. Scope of Application: This pencil works on various surfaces including metal, plastic, glass, wood, paper, and concrete. The yellow and red leads are ideal for marking on dark surfaces. Product Features: Designed for woodworking, this carpenter pencil offers a comfortable, non-slip grip. The 2.8mm diameter, deep hole tip, and fine point allow precise marking in narrow or deep spaces. Scope of Delivery: Includes 1 deep hole pencil and 24 refills (two packs of gray graphite refills, one pack of yellow paraffin refills, and one pack of red paraffin refills). Ideal for marking, drawing, DIY projects, and woodworking tasks. After-Sales Service: We offer a 180-day warranty. If you encounter any issues during use, please . We will provide a 100% satisfactory solution within 24 hours.