Quality material: using good material this carpenter pen is strong has a long service life; Its pen body is long the nib is thin and round easy for you to handle.the long-headed deep-hole are so you don’t have to worry that the handwriting after writingMaterial: Alloy + PlasticDeep hole : this deep hole pen is designed with a 0.79 inch/ 20 mm long tip, which can easily mark in deep holes or hard-to-reach places, convenient to useColor: Blue/Red/Blackof applications: multi-purpose deep hole marker pens are suitable for marking and drilling positions and furniture decorationDesign: this long nib can be applied for various surfaces such as wood, metal, glass, and plasticSize: 14x1cm/5.51x0.39inch1xMulti-Purpose Marker pen