Product Features

• • The flip-top cap seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping
  • Irwin® Strait-Line® introduces its new Hi-flow nozzle cap for improved chalk flow on permanent staining chalks
  • The cap allows for quicker chalk fills and less clumping when using higher-density permanent staining chalks
  • Irwin® Strait-Line® marking chalks have an innovative flip-top cap that keeps the chalk in the bottle where you want it
  • Exterior use
  • Visible after weeks of weather exposure and jobsite wear
  • For use on a variety of surfaces including wood, drywall, concrete, stone and metal
  • Permanent colors, especially black and red, produce long lasting lines that won't fade
  • Proprietary formulations for dark, sharp lines and reliable performance
  • Micro-fine for more marking power
  • Calcium carbonate, red iron oxide, silica-crystalline quartz compositions
  • 8.5 - 9.5 pH
  • Powder form
  • 3.4 - 3.45 Relative density
  • Produces color line that remains visible for weeks
  Up to 2 months permanence
  • Weather resistant lines remain visible after weeks of weather, sun and jobsite wear and tear