4 Pack Deep Hole Marker Pen, Tracer Marker Pen, Carpenter Pencil, Long Nib Marker for Wood, Metal, Concrete, Professional Construction Tools, Industrial Use, DIY Projects Durable Deep Hole Marker Pen: These 4 permanent marker pens feature a long nib design for precise marking in hard-to-reach areas; The waterproof ink ensures clear and long-lasting marks on wood, metal, and concrete surfaces; Ideal for professional carpenters and construction workers Versatile Marking Tool: Combines the functionality of a tracer marker pen and carpenter pencil; The endless pencil mechanism allows for consistent marking without sharpening; Perfect for detailed work in industrial and DIY projects Quick-Drying and Waterproof Ink: The ink dries quickly to prevent smudging and is waterproof for durability; Suitable for use in undesirable environments; Ensures accuracy and clarity in every mark Easy to Use and Portable: The lightweight design makes it easy to carry on-site; The comfortable grip provides ease of use during prolonged tasks; Includes multiple colors for color-coding different materials Ideal for Professionals: Designed for construction workers, DIY enthusiasts, and industrial workers; The pen pencil hybrid offers convenience and efficiency; Ensures precise marking for various projects