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Get precise and durable lines every time with Irwin Marking Chalk Refill! This high-quality, permanent red chalk is specifically designed for self-chalking line reels and ideal for professionals and DIYers alike. With a convenient 2.5 lb size, this product offers value for any marking job. Use it in construction, carpentry, or any application where clean lines are essential, and experience the benefits of quick, accurate results with ease. So, order your Irwin Marking Chalk Refill today and see why our customers rave about its performance!