IRWIN's 5 lb. Jug STRAIT-LINE® Marking Chalk offers reliable performance for contractors, builders, and maintenance professionals who need efficient jobsite marking. The convenient jug design allows for easy refilling of compatible chalk reels, while the bright orange color helps lines stand out across a variety of work surfaces. Ideal for framing, concrete work, grading, and layout projects, this marking chalk supports accurate results throughout construction and renovation applications.