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The Deep Hole Marker is all about precision & accuracy measurement! With a 20MM Long Nib, you will be able to mark down any measurement even if it's in a deep hole or narrow crevice!
The marker is water-resistant & fast drying, making it perfect on all sorts of surface, such as wood, metal, glass, plastic & so on.
The three option of colors for you to differentiate multiple measurement on a same piece of material, so you would never have to be confused agian!