INKZALL jobsite markers feature clog resistant tips and the ability to write on 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. For added user convenience, the INKZALL markers have a built-in hard hat clip for easy storage and access. The INKZALL cap can also be left off for up to 72 hours and the tip will remain completely functional. INKZALL markers showcase Milwaukee's relentless mission to provide innovative solutions to the end user and commitment to best-in-class durability.