These fittings are far more hygienic than the plastic SAFE-T BUMPERS and they stabilise the toilet seat by fixing the source of the problem, the loose hinge. They are also much easier to fit, no drilling required and you only need a pair of pliers to fit this kit. Full fitting instructions are sent with each kit. HOW DOES THIS KIT WORK - Toilet seats become loose because the holes in the toilet bowl are bigger than the metal rods that fit through them which means that the rods, and hence the hinges and seat, have room to move about. The standard fittings do nothing to stop this movement. The rubber fittings in this NON SLIP kit are squeezed into the gaps between the rods and toilet bowl by tightening the wing nuts. This eliminates any possible movement of the hinge, AND HENCE THE SEAT, and also holds the hinge tightly down onto the toilet bowl. THIS 6mm KIT CONSISTS of two unique cone - shaped NON SLIP rubber fittings, two 6mm wing nuts, two 25mm metal washers and two zinc plated metal threaded rods 6mm diameter by 50mm in length, (Longer 70mm THREADED RODS ARE ALSO AVAILABLE). The kit will fit all toilet bowls regardless of the size of the holes. It will fit all toilet seats that have the type of hinge shown in one of the pictures. 95% of this type of hinge have 6mm fittings but plastic seats sometimes have the 8mm fittings. If you purchase these 6mm fittings and when they arrive you find that you need the 8mm fitting then you can simply purchase the 8mm kit from my other advert and return the 6mm fittings to me for a full refund including P&P charges.