Package contents: 1 pair of toilet seat screws, fittings and fixtures, including one standard screw and one expansion screw. Size and compatibility: screw diameter about 13 mm; expansion screw diameter about 17 mm. Suitable for most toilets. Durable materials: expansion screw made from stainless steel and nylon. Strong, maintains shape, and resistant to corrosion and breakage in wet bathroom environments. Easy to use: DIY friendly. When you tighten the bolts, rubber plugs compress in the holes to create a tight, secure fit. Use scenarios: Replacing a loose or wobbly toilet seat in a home bathroom for improved stability and comfort. Upgrading bathroom hardware in rental properties, hotels, or offices to reduce maintenance and extend longevity. Restoring a secure fit after years of use in humid, damp bathroom conditions where standard hardware may corrode. Why choose this: provides a secure, durable solution with compatible sizing for most toilets, using stainless steel and nylon for longevity, and a straightforward installation that delivers a tight fit without special tools.