Item Name: Tools Universal Replacement Bolts Toilet Seat Hinges Fixing Screws Bathroom Nut. Description:Suitable for 14-19mm hole for 2 toilet seats, universal uses.Long: 50mmThey are very easy to fit done in a matter of minutes.Material: Rubber+metalPlastic washers will not rust like metal.Color: blackWhen you tighten the bolts they squash up in the holes making a good tight fit.Screw Diameter: 6mmThe rubber grommets in the kit have a threaded section so you can just push them into the holes in the top of the toilet pan and when you tighten the screw it expands and tightens itself into the hole, without the need of a bolt on the other end of the screw. When you tighten the bolts the washers down into the holes and you need to be careful you do not tighten the bolt so much it pushes through the washer.Package Contents:1 pair x Toilet Seat Hinges ScrewsNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is /- 1-3cm.