Hexagonal Washer Composite Drill Self-Drill

– Key Selling Points: Double washer composite structure, waterproof + anti-loosening double protection; hexagonal head compatible with wrenches, high installation efficiency

– Applicable Scenarios: Roofs with high waterproof requirements, outdoor steel structures, photovoltaic brackets

– Optional Materials: Carbon steel (color zinc/black zinc), Stainless steel 410/304