Presenting Irwin STRAIT-LINE 2.5 lb Blue Chalk, a premium refill for reel-type chalk line boxes that delivers bold, accurate markings on the job site. This standard blue chalk comes in a durable plastic squeeze bottle with a rapid-fill spout, making refills quick and clean. Engineered for versatile use, it performs reliably on interior surfaces like wood and drywall as well as exterior materials such as concrete, stone, and metal. Marks remain temporary, yet highly visible, helping you stay on track without leaving lasting residue.

Experience value: The high-visibility blue shade stands out against rough textures, improving line visibility and measurement accuracy throughout precise layout work. Its moisture-resistant formula resists smudging, so you can work confidently in varied conditions.

• Chalk Line Compatibility: Designed for reel-type chalk line boxes, delivering smooth, consistent line marks for precise layouts.
• High-Visibility Blue Color: The vivid blue improves contrast against wood, drywall, concrete, stone, and metal for quick, accurate lines.
• Generous 2.5 lb Supply: A long-lasting quantity reduces frequent reorders during large framing and layout jobs.
• Convenient Packaging & Fast Fill Spout: The plastic squeeze bottle with a rapid-fill mouth speeds refills and minimizes mess on site.
• Temporary, Clean Marks: Marks disappear cleanly after measuring, preventing residue on finished surfaces.

Why this chalk stands out for pros: Built to meet the demands of professional carpentry, masonry, and remodeling projects, it combines reliability with ease of use. Whether you're laying out walls, doors, or projects that require straight lines, this chalk helps you stay on target from start to finish.