2 toilet seats with long locking nuts prevent loosening and provide a stable, secure fit for a better user experience. Multifunctional fixed toilet seats with sturdy rubber components offer stable support and peace of mind in daily use. Built from corrosion-resistant steel, these seats fit most toilet models, enabling easy installation and longer service life. Expansion screws designed for bathrooms, public toilets, and commercial establishments improve lid stability across different environments. Use scenarios: - In a family bathroom, the secure fit helps keep the seat in place for children and seniors. - In high-traffic public restrooms and commercial facilities, the corrosion-resistant steel and reliable fixings withstand heavy use. - During bathroom renovations, the seats install easily on most models, delivering durable performance with minimal downtime.