- Weather-resistant lines remain visable after weeks of weather and jobsite wear and tear
- The flip-top cap seals the chalk in an airtight chamber
- Chalk bottle shape eliminates rolling off work surfaces
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.