Standard blue marking chalk for self-chalking chalk line reels. IRWIN rates the Standard line for interior or exterior use and describes its marks as temporary, holding up to roughly a week of weather exposure. It is the everyday choice for layout lines you do not need to keep.

• Temporary marking chalk
• Interior or exterior use
• Provides great visibility
• Flip-top cap seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping
• IRWIN application list: roofing, siding, paneling and interior layout
• Weatherability: about 1 week (IRWIN rating, based on average rainfall of 4 in. per month)
• For self-chalking chalk line reels
• Color: Blue
• Container size: 5 Lb
• Manufacturer part: 65101ZR

Tip: IRWIN's chalk range is graded by how long the line lasts outdoors - Dust-Off (interior, wipes away), Standard (about 1 week), Hi-Visibility (2-3 weeks), Permanent (about 2 months) and Permanent Staining (4+ months). Match the chalk to how long you need the line to survive.

FOR CALIFORNIA SHOPPERS

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• ⚠  WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov