The round hinge plate make this extra sturdy and ideal. If your current seat fittings are loose making your toilet seat move around on the pan.
Rubber bungs slide into the holes perfect and when you tighten the bolts they squash up in the holes making a good tight fit. Please do not over tighten the bolt.
If your toilet seat kept moving, please use these toilet seat fixing screws to replace the useless plastic inserts supplied with a new top fix seat. Fits for most UK standard size toilet seats with top fix hinge.
Plastic washer will not rust like metal. Brass nuts can antiskid and antirust. You don't need to tight screw from bottom with these toilet seat hinges screws.