OX Pro Chalk Refill 226g Blue

High-Visibility Blue Marking Chalk - Bright blue chalk provides excellent visibility on dark surfaces and in low-light conditions for clear, accurate marking. Ideal for Layout & Alignment Work - Perfect for marking layouts, setting-out work, straight lines and reference points across a wide range of construction and trade applications. Suitable for Indoor & Outdoor Use - Versatile marking chalk performs reliably in both indoor and outdoor environments, making it ideal for professional contractors and DIY users. Ideal for Corrections & Layout Changes - Easy-to-see markings make it suitable for highlighting adjustments, layout changes and temporary reference points on site. Long-Lasting Weather Resistance - Produces durable markings with weather resistance of up to one week, helping maintain visibility throughout the project.