Irwin Strait-Line Blue Standard Chalk Line Chalk, 8 oz. is designed specifically for use with reel type chalk line boxes, making it an essential tool for both interior and exterior marking tasks. This chalk is conveniently packaged in a plastic squeeze bottle with a fast fill spout, allowing for easy and mess- refilling. It works effectively on a wide variety of surfaces including wood, drywall, concrete, stone, and metal. The blue chalk marks are temporary yet provide excellent visibility, making your measurements and lines clear and precise. This product is i for professionals and DIY enthusiasts who need reliable and easy-to-use chalk for their projects. Model Number: 64901