Built with the tradesman in mind, the OX TOOLS Trade Single Gear Thick Line Chalk Reel is designed with Roofers in mind. The line of this chalk reel is extra thick as well as braided to ensure the best resistance to abrasive surfaces. The line also lays large, easily visible lines. The hook of the chalk reel has a large opening designed to hold nails, a notch in the opening ensures a strong grab onto the nail and provides a more accurate snap. The body of the chalk reel is comprised of an ABS plastic housing which provides durability on the jobsite. The large size of the body has a high capacity for chalk, meaning you spend less time refilling and more time doing layout for the job! The case features a large sliding window on the side for filling chalk quickly and easily. The case also features a notch in the side for holding the hook. The chalk reel also has a self-sealing felt grommet for layout or refills without spills.