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500 Crete-Flex screws per box. Flat head with #3 phillips drive. <br><br>#14 diameter stainless steel fastener for masonry and concrete applications. Special heat treatment protects inherent corrosion resistance of the 410 stainless steel material. Stalgard coating provides 1600 hours of salt spray resistance. Larger .201 root diameter provides exceptionally high shear values. 14-10 heavy-duty threads provide high in-place performance.