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Schluter Kerdi-Board-Zs coarse thread screws are engineered for secure fastening of Kerdi-Board waterproofing panels in wet areas. These 1-1/4 inch screws feature a specialized coarse thread design that provides superior grip and holding power in cement board substrates. The 100-pack quantity ensures you have adequate supply for residential or commercial tile installations. Ideal for bathrooms, showers, and other moisture-prone applications where reliable panel attachment is critical to system performance.