The Tajima Chalk-Rite Jam-Free Chalk Line is engineered for professional performance. It features an extra bold braided line that delivers precise 0.04-inch (1.0 mm) markings, ensuring clear and highly visible lines. The durable ABS case is built to withstand tough conditions and includes a large refill port for quick and easy chalk replacement. Additionally, the five-gear winding mechanism ensures smooth, efficient operation, minimizing downtime. Ideal for both construction and carpentry projects, this chalk line combines jam-free reliability with professional-grade quality for accurate and effective marking every time. JamFree Operation Engineered with an innovative design, allowing for uninterrupted operation and precise, clean lines in all your construction and carpentry projects. Extra Bold Line Featuring a durable braided line, this tool produces a clear and prominent 0.04inch 1.0 mm bold line, ensuring precise and highly visible markings. Durable Construction Built with a tough ABS case for longlasting durability, this tool also has a large refill port, making it easy to refill chalk quickly and keep you working without interruption. Efficient Mechanism Equipped with a 5gear winding mechanism, this tool ensures quick and smooth operation, allowing you to work efficiently and save time on every project. Professional Quality Designed for various marking tasks in construction and carpentry, this tool offers exceptional performance and reliability, making it a trusted choice for professionals.