These multi-purpose deep hole marker pens are the perfect tool for a wide range of applications, from woodworking and carpentry to bathroom and home decoration. With their long nib heads, these pens can easily reach into deep holes and tight spaces, allowing you to mark and label with precision. The set includes four vibrant colors - red, black, blue, and green - ensuring you have the right hue for any task. The waterproof ink dries quickly and won't smear or fade, making these markers ideal for both indoor and outdoor use. Whether you're a professional contractor or a DIY enthusiast, these versatile pens will become an indispensable part of your toolkit. With their sturdy construction and long-lasting ink, you can count on them to deliver reliable performance project after project. Elevate your marking and labeling game with this convenient 4-piece set of deep hole marker pens.