The rubber bungs slide into holes perfectly and when you tighten the bolts they squash up in holes to make a good tighten fit Top Fix: you can get it in by using a screwdriver to push it down from the base. Save time and effort Make from Stainless steel and rubber, strong and Enduring The rubber grommets with a threaded section, when you tighten the screw it expands and tightens itself into the hole, without the need of a Bolts on the other end of the screw Great for breakn or old toilet hinges. Fit for most standard toilet with top fix hinge, Manufacturer: Obotsnoi