The IRWIN 65102 Mason Line Chalk in red is a 5lb permanent marking chalk designed for exterior use. This chalk is ideal for creating long-lasting and weather-resistant markings that remain visible even after weeks of exposure to the elements. With a reputation for excellence and performance spanning over 30 years, IRWIN's Strait-Line products are the go-to choice for professionals needing reliable marking tools for carpentry, bricklaying, masonry, roofing, and various other applications.





