- Exterior use
- Visible after weeks of weather exposure and jobsite wear
- Permanent Marking Chalk
IRWIN® STRAIT-LINE® marking chalks have an innovative flip-top cap that keeps the chalk in the bottle where you want it. The flip-top cap seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping.
The IRWIN® STRAIT-LINE® chalk range has a wide range of permanencies and colors so whether working indoors or out, on finished surfaces or in extreme conditions, IRWIN STRAIT-LINE has the ideal chalk for every job.
The Red Chalk remains weather resistant and visible after weeks of weather, sun and jobsite wear and tear.