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Marking chalk marks are temporary. Provides greater visibility in standard lighting conditions. Durable formula is weather-resistant and suitable for interior or exterior use. Use to show layout changes and corrections on metal, concrete, lumber, plastic, cardboard and other surfaces. IRWIN Tools STRAIT-LINE 65201 Standard Marking Chalk, 2.5-pound, Blue (65201)
From the Manufacturer
The 65201 Strait-Line 2.5lb Blue Chalk is what you need to help get things Strait. The Strait-Line 2.5lb blue chalk is great for indoor and outdoor use, carpentry, bricklaying, masonary, roofing,carpet installation,floor and wall tiling, painting, decorating and many other uses. The blue chalk is a temporary chalk that will disapear after a while. For more than 30 years, Strait-Line products have represented the standard for excellence and performance in marking tools.
Tim
August 26, 2025
Worked out great,didn't clump up and left a nice bright line.
Chris Newman
August 7, 2025
This chalk works pretty well on old and darker colored lumber. On new, light colored woods (pine and fir) you cannot see the line at all.
Wm. D
November 12, 2024
It just didn't strike a good line for me...
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