Milwaukee Inkzall 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, cinderblock and concrete and the ink dries quickly to reduce smearing markings, 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 commitment to best-in-class durability and their relentless mission to provide innovative solutions to the end user. Features and BenefitsSuitable for writing on rough surfacesMarker will not dry out, even after 72 hours without the capSuitable for writing on concrete, wood, metal, OSB board, plastic, cardboard, glass or ceramicsCan be used on wet, oily, dusty, rusty or rough surfacesQuick-drying ink reduces smudging on plastic or metal surfaces