- Increase work efficiency with refillable ink and a long nib designed to mark deep holes with precision and comfort. - Oil-based waterproof ink for indoor and outdoor use, delivering vivid color results even in deep holes. - No smearing thanks to quick-drying long felt tips that keep your markings clean and precise; the waterproof construction marker helps your projects stay on track. - Ergonomic design with a comfortable grip and a cap clip, making this marking tool suitable for both professionals and enthusiasts. Use cases: - Mark deep drill holes or layout reference points on wood, metal, or masonry before drilling or cutting. - Ideal for construction sites and workshops for indoor and outdoor marking, alignment lines, and labeling. - Useful for assembly and layout tasks that require durable, smear-resistant marks that endure handling and exposure.