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Product Description Marks are temporary. Provides greater visibility in standard lighting conditions. Durable formula is weather-resistant and suitable for interior or exterior use. Use to show layout changes and corrections on metal, concrete, lumber, plastic, cardboard and other surfaces. IRWIN Tools STRAIT-LINE 64904 Standard Marking Chalk, 8-ounce, White (64904) From the Manufacturer Chalk Refill, 8 ounces of white chalk refill for all reel type chalk line boxes, packaged in a plastic squeeze bottle with fast-fill spout, and snap cap to prevent spilling and moisture in chalk. Irwin tools are made of only the finest materials, manufactured to exacting tolerances.