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Roofing Screw Nails for Roof Building. Multiple Surface Finishes: Available in Galvanized, Zinc Plated, and Yellow Plated options. Custom Shank Types: Options include Smooth, Twisted, Ring, Screw, and Square shanks. Versatile Washer Options: Compatible with Rubber and EPDM washers for enhanced sealing. Wide Size Range: Sizes available from 3.5x65mm up to 7.1x120mm. International Standards: Meets ANSI, DIN, GB, ISO, and JIS standards. Free Samples: Complimentary samples are provided upon request. Flexible Payment Terms: Accepts T/T, L/C, West Union, PayPal, and Money Gram. Fast Delivery: Off-season delivery in 15-20 days; Peak season in 30-60 days.