[Deep hole marking] The total length of this multi-purpose deep hole marker is about 138mm/5.43 inches. It can reach areas that are difficult to reach. It is suitable for marking through holes or other narrow areas, and is easy to use and carry. [Fast drying and waterproof] The ink can dry quickly after writing, so the handwriting is not easy to be damaged by hands or cloth. It is also waterproof, so it is also suitable for outdoor use and cannot be easily removed underwater. [High quality material] This deep hole marker is made of plastic shell and carbon pen tip, which is strong and wear-. Made of high-quality materials, solid and reliable, with long service life; This pen has a slender body and a fine round tip. It contains permanent ink, waterproof and stain , fast drying, no xylene and odorless. [Package content] You get hole marks, including 3 blue, 3 red, 2 black and 2 white). 4 Different colors can distinguish marks with different meanings and can be marked on dark surfaces. The quantity is enough for your use and replacement. You can share it with colleagues and friends. [Wide use] Deep-hole marking pen can be applied to surfaces, such as metal, plastic, glass, wood, paper, etc. It is widely used in furniture decoration, hardware processing, automobile manufacturing, bookshelf, lamp drilling position, industrial processing and other fields. Color: As Shown Material: plastic Package Contents: 10 x Marking pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.