Irwin 8 oz. Orange Marking Chalk Refill

Irwin STRAIT-LINE marking chalk is formulated for high visibility on dark surfaces and in low-light conditions, making it ideal for layout changes, corrections, and exterior snap line applications. The temporary formula provides crisp, clear marks that remain visible while working. Each bottle features an engineered flip-top cap that seals the chalk inside an airtight chamber. This design keeps moisture out to reduce clumping and prevents accidental spills on the jobsite.