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Aozhan's innovative countersunk drill tail screws combine drilling and tapping functions in one operation with their specially designed drill points that penetrate thin steel sheets effortlessly. Manufactured from high-strength alloy steel with zinc or color-zinc coatings (GB/T 15856.1 compliant), the countersunk heads create flush finishes ideal for color steel plates, aluminum alloys and other materials in prefab buildings, steel structures and ventilation ducts - significantly improving construction efficiency while reducing labor costs.
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