Milwaukee Inkzall Chisel Tip Jobsite Markers features clog-resistant tips and gives you the ability to write on dusty, wet, or oily surfaces. The durable permanent marker tips are designed for writing on rough surfaces such as OSB, cinderblock, and concrete, and the ink dries quickly to reduce smearing. You can leave the marker cap off for up to 72 hours and the tip will remain completely functional. Milwaukee Inkzall markers showcase their relentless mission to provide you with innovative solutions and commitment to best-in-class durability.