Package Includes: you will get a total of 3 pieces of deep hole marker pens in 4 colors, namely, red, blue, green and black colors, sufficient quantities and diverse colors can satisfy your daily use and replacements, you can also share them with your friends Suitable Size: the total length of long head deep hole markers is about 13.7 cm/ 5.4 inches, and the long tip is approx. 20 mm/ 0.8inches, the proper length is suitable for people to use, these pens have clip designs, can be clipped on your pocket, folder, or notebooks, not easy to miss out and carry around Quality Material: these long nib marker pens are made of plastic pen shell and metal long nib, waterproof, sturdy and serviceable, the long nib is designed in slim and round, with comfy hand tactility and non slip surfaces, easier to use Marking Simply: the deep drill pen has a long nose, which can be applied to work on those deep holes or hard to reach areas to mark, make marking simple and quick, and the mark pen is written fluently and continuously, not easy to smear or smudge, making your carpentry easier Wide Applications: the marker for deep holes are widely applicable for most surfaces, such as wood, concrete, stone, iron, metal, glass, plastic, and other hard surfaces, can also be suitable for marking on home furniture, hardware and more, which are practical every day