Premium MaterialThe Toilet Seat Hinge Fasteners Are Made Of Rubber And Stainless Steel, The Rubber Is More Resistant To Dirt And Wear, And Not Easy To Break. Under The Protection Of Rubber, The Metal Screws Are Less Prone To Rust And Durable For Long-Term Use. Easy To InstallRubber Grommets Have A Threaded Section So You Can Just Insert Them Into The Holes At The Top Of The Toilet Bowl. When You Tighten The Screw, It Expands And Pulls Into The Hole Without The Need To Screw The Other End Of The Screw. Hinge PlatesThe Round Hinge Plate Can Make These Hole Bolts Stiffer And Stronger Toilets. When Tightening The Screws That The Washers Push Into The Holes, You Must Be Careful Not To Tighten The Screw So Much That It Pushes Through The Washer. Wide ApplicationsA Strong, Reliable And Sturdy Mounting Kit Specially Designed For Toilet Mounting Brackets. Toilet Lid Seat Fittings Fit Most Standard Toilet Seats With Top-Fix Hinges. Convenience And Time Saving. Package IncludeYou Will Get 2 Pieces Of Toilet Hinged Blind Hole Fittings With Expansion Rubber Bolts, Nuts, Washers, Easy For Your Daily Use. You Only Need To Assemble The Top Fittings Of The Toilet Seat And Hinge Once, Which Can Be Used For Several Years.