Material The screws and fasteners of the toilet seat are made of high quality rubber and stainless steel, which are strong, rustproof, anti-corrosion, strong and durable.Design The expansion rubber glue has a threaded part. When you tighten the bolt, push it into the hole to form a good tight fit. It expands and screws into the hole by itself, and there is no need to install the bolt above the other end of the screw.Product AdvantagesToilet Seat Accessorieswith excellent toughness and stability, it can fix your toilet lid and can be easily assembled in minutes. It comes with accessories such as rubber plugs and seals. When the bolts are tightened, the washers will be pushed into the holes.Package Included4 toilet seat expansion rubber fittings, 2 expansion screws with plastic plugs, 2 extra stainless steel washers.Information about SizeThere are two sizes of toilet seat expansion rubber accessories, M6*8.4cm (2pcs), M6*5.4cm (2pcs), M6*4.9 expansion screw cm, seal outer ring 17mm, inner ring 7mm, expansion ball diameter 14mm-18mm.