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Looking for the perfect tool to mark lines with precision? Look no further than the Keson Marking Chalk Waterproof Blue 5 lb. Made in the USA by a Veteran-Owned Business, this waterproof chalk is designed for use with chalk line reels and produces strong, bold lines that are easily visible on any surface. Its durable formula ensures long-lasting performance and can be used both indoors and outdoors. Perfect for construction, carpentry, and even arts and crafts, the Keson Marking Chalk is an essential tool for anyone who needs to make precise lines quickly and efficiently. With its versatile application and top-quality performance, it's no wonder that this chalk has earned a reputation as one of the best on the market. So if you need a reliable tool to help you get the job done right, look no further than Keson and their Marking Chalk Waterproof Blue 5 lb.