OX Pro 40oz/1.1kg Standard Blue Marking Chalk Permanence 1, Precise & Reliable Markings Ideal for Varied Surfaces, General Construction Line Refill Powder Reels

STANDARD BLUE CHALK LINE POWDER: 1.1kg (40oz) of bright blue marking chalk – the go-to colour for temporary, removable layout lines on construction sites and workshops. FITS ALL STANDARD CHALK LINE REELS: Fine-grain chalk powder refills all standard chalk reels quickly and cleanly – no waste, no mess. Compatible with OX and most trade chalk line reels. MARKS ANY SURFACE: Delivers crisp, visible lines on floors, walls, timber, concrete and masonry – ideal for tiling, flooring, framing, roofing and general construction layout work. TEMPORARY 1-DAY WEATHERABILITY: Rated for 1-day weatherability – markings stay bright and visible throughout the job then disappear naturally, with no permanent staining on finished surfaces. LEAK-PROOF AIRTIGHT CAP: The quarter-turn twist cap creates an airtight seal, locking out moisture to prevent clumping – your chalk stays dry, free-flowing and ready to use every time.