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Construction Plastic Hex Screw Dome Covers. UV Stabilized Material: Made of UV stabilized modified polypropylene to resist sun cracking and fading. Full Weatherproof Barrier: Blocks rain, snow, dew, and salt mist for coastal projects. Anti-Corrosion Protection: Isolates screw heads from oxygen and humidity to prevent rust streaks. Flexible Snap Structure: Easy manual installation without tools with a firm lock. Acid & Alkali Resistant: Adapts to industrial, agricultural, and residential metal roof scenarios. Impact Resistant: Anti-hail damage for long-term roof service life. Customizable Surface Finish: Surface gloss or matt finish available as client request.