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4-Piece Replacement Kit: Includes 2 silver quick-release hinge bases and 2 black rubber expansion fixings with matching screws. Together they form one complete left and right fixing pair for replacing compatible loose, worn or missing top-fix toilet seat hardware Durable Mixed Materials: Each fixing combines a corrosion-resistant SUS304 stainless steel screw and M6 washer, an elastic SBR rubber sleeve and a durable brass threaded insert. These materials provide flexible expansion, firm thread engagement and reliable performance in everyday bathroom conditions Secure and Quieter Fit: Tightening the screw compresses the rubber sleeve so it expands against the inside of a compatible mounting hole. This creates a firmer hold that helps reduce toilet seat movement, wobbling and unwanted noise during normal use Simple Top-Fix Installation: Install the toilet seat bolts entirely from above using a screwdriver, making them suitable for many enclosed or blind-hole WC pans. Insert the rubber sleeve, position the hinge base, align the seat and gradually tighten both sides until secure Check Dimensions Before Ordering: The rubber sleeve measures approximately 40 mm long with a 14 mm lower diameter and an 18 mm widest section; the screw is approximately 48 mm long. The mounting base is about 44 mm across, while the connecting pin is approximately 37 mm high with a 7.8 mm top diameter. Compare the fixing hole and hinge connection with your original parts before purchase