Feature:1. 30mm Nib: Deep Hole Marker comes with a 30mm long nib that can be used to marks deep holes or hard to attain places, making it more convenient for carpenters.2. Portable Pen Clip: The Hole marker tool is designed with a portable pen clip, allowing you to secure the carpenter ink pen to your pocket or notebook to avoid dropping or losing it.3. Refillable Ink: The marker pen is refillable, just 3 or 4 drops of ink, too much ink will leakage, easy operation.4. Plastic Material: The Marker Pens are made of plastic material, which is lightweight and wear resistant for a long service life.5. Multipurpose: This architectural marker is suitable for marking location and furniture decoration, metalworking, woodworking industry, glass industry, plastics industry, automobile manufacturing industry, etc. It can meet your various requirements.Specification:Item Type: Long Head Deep Hole MarkerMaterial: Plastic, Watercolor PaintFeatures: Long Nib, Water Resistant Ink, Quick Drying Hole MarkersProduct Application: Home Decoration, Hardware Processing, Automobile Manufacturing, Etc..Package List:3 xLong Head Deep Hole Marker