Features and Benefits:�Wear Resistant tip - acrylic nib ideal for rough surfaces such as OSB, cinder block and concrete�Quick dry time: reduced smearing markings on PVC, HVAC pipe and steel studs�72 Hour cap off life - leave the cap open for up to 72 hours without drying out�Hard hat clip: attaches for easy access�Anti-roll design: marker won�t roll away without cap�Writes through dusty, wet and oily surfaces�ASTM D 4236 certified: non-toxic ink�Durable marker tip for writing on concrete, OSB and rough surfaces�Built-In hard hat storage clipINKZALL® jobsite 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, cinder block 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 Milwaukee's commitment to best-in-class durability and their relentless mission to provide innovative solutions to the end user.