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Universal Size & Dimensions: The toilet seat fittings Fits most standard toilet seat with 14mm to 16mm blind holes. Screw dimensions: M5 x 48mm; Rubber nut length: 40mm; Top flange diameter: 22mm. Please measure your toilet hole diameter before purchasing to ensure a perfect fit. Package Content: You will receive 6-piece toilet seat screws: 6 x stainless steel screws, 6 x metal washers, and 6 x expanding black rubber well nut sleeves. Perfect set for replacing worn-out or loose toilet seat hinges. Expanding Anti-Slip Design: Engineered with rubber sleeves that expand when tightened inside the mounting hole. This creates a rock-solid anchor that prevents the toilet seat from shifting, loosening, or sliding over time. Premium Durable Materials: Made of stainless steel bolts and washers combined with rubber. Resistance to rust, corrosion, and moisture ensures stability and long-lasting performance in wet bathroom environments. Easy Top-Fixing Installation: Designed specifically for blind-hole WC toilets where bottom access is difficult. Simply insert the rubber expansion sleeve from above and tighten the screw with a screwdriver in minutes.