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Irwin Strait-Line RED Marking Chalk delivers precision marking for construction and woodworking projects. This 4oz container of vibrant red chalk produces crisp, visible lines on virtually any surface—wood, concrete, metal, and drywall. The fine powder formula ensures clean application without excessive dust, while the compact size makes it convenient for job site use. Trusted by professionals for layout work, cutting guides, and reference marks, this marking chalk is an essential tool for accurate measurements and straight lines every time.