• This deep hole marker pen is designed with a 20mm/0.79inch long tip, which can easily mark in deep holes or hard-to-reach places, convenient to use.
• This long nib marker can be applied for various surfaces such as wood, metal, glass, and plastic.
• Waterproof and quick-drying, environmentally friendly and practical, not easy to fade after washing and smearing.
• It is suitable for marking the position of deep hole processing required by industrial production such as home decoration, processing, and automobile manufacturing.
• Carpenter's long-head marker pen is used for deep-mouth tile marking and bathroom installation marking.

3 Pieces Deep Hole Marker Pens