The Milwaukee Inkzall Permanent Markers (48-22-3100) are specifically designed to meet the demands of jobsite conditions. These markers feature a clog resistant tip that allows for writing on dusty, wet, and oily surfaces. Additionally, the durable tip is optimized for rough surfaces like OSB, cinderblock, and concrete. One convenient feature of these markers is the hard hat clip, which allows for easy attachment to the brim of hard hats. This ensures quick and convenient access to the marker whenever needed. Furthermore, these markers have a quick dry time, reducing the risk of smearing and ensuring clear and precise marking. The fine point marker, with its black permanent non-toxic ink, provides a reliable and long-lasting marking solution. Not only is the ink non-toxic, but it also dries in seconds, allowing for immediate handling without any smudging or smearing. In conclusion, the Milwaukee Inkzall Permanent Markers are a must-have tool for any professional working in challenging jobsite conditions. Their clog resistant tip, hard hat clip, quick dry time, and fine point marker make them a reliable and efficient choice for all your marking needs.