- Precision marking: refillable ink and a long tip design provide precise marks in deep holes, boosting work efficiency. - Convenience: the long marker tip enables precise writing and complex lines. Waterproof oil-based ink makes it suitable for outdoor and indoor use, even with deep holes. - Effective project completion: quick-dry and waterproof design prevents smudging, keeping work clean and professional and saving time. - Easy to carry: durable hat clip and ergonomic grip for comfortable use. This construction marker is easily transported in bags or cases, delivering marking capability anytime and anywhere. Use scenarios: - Marking drill guides and deep holes in wood or metal during carpentry or cabinetry work. - Creating precise lines on indoor or outdoor surfaces in construction or fabrication projects. - Field marking for installation tasks where portability and reliability are important.