This Milwaukee INKZALL permanent marker in blue is designed for tough construction environments. It features a durable tip that stays sharp and resists pressure. The acrylic tip is ideal for rough surfaces like OSB and concrete. The marker can write for over 72 hours after the cap is removed. It's suitable for use on concrete, wood, metal, plywood, boards, OSB, and plastics. This marker works on wet, oily, dusty, rusty, and debris-covered surfaces. It dries quickly, reducing smudging on PVC and metal. Its slim design allows for use in tight, hard-to-reach areas. Key Features: - Durable, non-mushrooming tip - Works on rough and tough surfaces - Writes for over 72 hours uncapped - Suitable for wet, oily, and dusty conditions - Quick-drying ink
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