Writes on dusty, wet and oily surfaces. Clog resistant marker tip. Built-in hard hat storage clip. The 48-22-3100 Milwaukee Inkzall Permanent Markers are optimized for jobsite conditions. The durable tip is designed to withstand writing on rough surfaces such as OSB, cinderblock and concrete and writes through dusty, wet or oily contamination. The hard hat clip is designed to clip onto the brim of hard hats for easy access. Clog resistant tip- writes on dusty, wet and oily surfaces and is optimized for rough surfaces such as OSB, cinder-block and concrete. Hard hat clip- attaches for easy access. Quick dry time: reduced smearing marking. Fine point marker: black permanent non-toxic ink. Ink dries in seconds. Includes: (108) 48-22-3100 INKZALL black fine point jobsite permanent markers.