1. [Designed for Tight Spaces]:Long Nib Marker Professional Carpenter Marker Set is made for tight spaces, with a long, thin tip that can easily be inserted into deep holes, crevices and hard-to-reach areas. Whether you're marking nail holes, screw holes, or pinpointing on wood, metal, plastic, or other materials, this tool can help you with all kinds of delicate work 2. [Quick-drying waterproof ink]:Construction pens use quick-drying waterproof ink to leave long-lasting and clear markings on a wide range of surfaces such as aluminum, concrete, glass, metal and more. Its strong waterproof performance makes the markers not easy to fade, even in a humid environment can remain clearly visible, to meet your various needs 3. [Built-in Scale Design]:Permanent markers equipped comes with a 6cm scale marking on each pen body for quick and accurate measurements. This design makes the tool more efficient when marking, is an indispensable and practical addition to your toolkit, help you all kinds of projects smoothly! 4. [ and Material]:The Long Head Deep Hole Marker is made of high quality PP material to ensure durability and provide a comfortable grip so you won't feel fatigue during long time use. Whether you're a professional or a DIY enthusiast, this pen can maintain its excellent performance in a variety of work environments