IRWIN's 8 oz. Bottle STRAIT-LINE® Marking Chalk, Hi-Viz Yellow delivers dependable performance for contractors, builders, and homeowners who need reliable markings on a variety of surfaces. Its easy-pour bottle design supports efficient refilling of chalk reels, while the bright color helps improve line visibility in demanding work environments. Ideal for framing, installation, renovation, and outdoor layout projects, this marking chalk is a practical addition to any tool collection.