Jobsite permanent markers feature clog resistant tips and the ability to write through dusty, wet or oily surfaces. Durable marker tips are designed for writing on rough surfaces such as OSB (oriented strand board), cinder block and concrete. The ink dries quickly to reduce smearing markings, without drying out quickly when the cap is left off. Built-in hard hat clip for easy storage and access. ASTM-D-4236.
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