The DURA-INK® 5 is a permanent ink marker that uses an extended micro tip for precision marking needs and is ideal to use through drill holes, mounting brackets, or in any hard to reach area. The industrial-strength ink dries quickly on almost any surface and is wear-resistant and weather-resistant. Micro tip for precision marking Fast-drying Xylene-free ink eliminates health concerns Tip length : 3/4" (19mm) Mark size : 1mm