Quality Material: The pen body is long, and the nib is thin and round, making it easy to handle. Long Nib Marker: Designed with an extended 30 mm needle-nose tip, this deep-hole carpenter pen reaches areas that other markers cannot, ideal for marking through holes or in tight spaces. Waterproof & Quick-Drying: This carpenter marker is waterproof, smudge-proof, and quick-drying, with ink that resists fading. It writes on a variety of surfaces including aluminum, sheet metal, concrete, stone, iron, steel, glass, wood, and plastics. Package Includes: 6 multi-purpose deep hole pens in three colorsred, blue, and blackwith two pens of each color. The set provides ample supply for long-term use and sharing. Widely Used: Suitable for use on metal, plastic, glass, wood, paper, and more. Durable and reliable for marking tasks in home decoration, hardware processing, automobile manufacturing, and industrial applications.