Irwin 1/2 in. x 4-1/2 in. Black Waterproof Lumber Crayon

The Irwin 1/2 in. x 4-1/2 in. Black Waterproof Lumber Crayon is designed for reliable layout and marking across demanding jobsite environments. Formulated to write smoothly on lumber, concrete, ceramics, and metal, this crayon creates permanent, highly visible marks that resist fading and wear from sun, moisture, and jobsite handling. Featuring a non-toxic, weather-resistant formula, it performs effectively on oily, slick, wet, cold, and dry surfaces. Ideal for exterior layout, roofing, concrete work, and metal fabrication, this marking crayon ensures clear and durable identification lines throughout the construction process.