The milwaukee inkzall jobsite chisel point markers feature clog resistant tips and the ability to write through dusty wet or oily surfaces the durable marker tips are designed for writing on rough surfaces such as osb cinder block and concrete and the ink dries quickly to reduce smearing marks without drying out quickly when the cap is left off for added user convenience the inkzall markers have a built in hard hat clip for easy storage and access inkzall markers confirm to milwaukees commit