Permanent ink marker for deep holes, black, ideal for hard to reach spotting. suitable for most dry surfaces. practical clip-on holder for one-handed working. permanent ink, removable on smooth, glossy surfaces with alcohol and other solvents. patented adjustable telescopic stainless steel tip: 3 times more marking capacity when using 7 mm. maximum performance: lead usable on both sides. lead can be rotated 180° up to 7 times and more for long marker life.