Packaged & DimensionIncludes 6 Pieces Of Toilet Seat Bolts, Enough For Your Replacement. Expansion Ball Diameter Is 1.7 , Length 4 , Unexpanded Width 1.4 , Metal O-Ring Diameter 1.6 .Suitable For Most Seats Of ToiletUniversal Toilet Seat Screw Sizes, Suitable For 14-18Mm Holes, Fits Most Standard Toilet Seats With Top Mount Hinge. (But Please Confirm The Size Before Placing An Order.)Flexible Rubber PlugsWhen You Tighten The Bolts, The Flexible Rubber Plugs Slide And Sink Snugly Into The Hole, To Ensure A Tight Fit.Durable And SturdyMade Of Quality And Sturdy 304 Stainless Steel And Premium Rubber. Avoid The Problem Of Screw Burst Or Rubber Broken Easily, Great For Broken Or Old Toilet Seat Hinges.Easy To Install It Only Takes 2-3 Minutes To Remove The Old Bolts And Clean The Area, And Install The New Toilet Seat Nut.