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SUFFICIENT SUPPLY: Comes with 500 pieces of tile backer board washers, providing ample quantity to cover extensive assembly and construction projects without the need for additional purchases ACCURATE SIZE: Precise size specification for stainless steel washers – 35mm diameter and 5mm hole, perfectly matching various screw sizes for enhanced compatibility DURABLE GALVANIZED STEEL: Made of high-quality galvanized steel, these plasterboard washers are sturdy and not easily deformed, with excellent corrosion and wear resistance for long-lasting performance EASY & SECURE FIXING: Easy to install – these insulation washers can be firmly fixed on walls and floors with suitable screws, featuring strong tightness, no need for complex tools, and efficient installation VERSATILE USAGE SCENARIOS: Versatile application for galvanized steel washers with six holes – suitable for fixing various construction panels such as insulation boards, tile backer boards, gypsum boards and composite boards, compatible with common substrates like wood and concrete