rubber, nylon, ABS and stainless steel, this toilet seat fixings kits is sturdy and, a long time use Top fixing toilet seat fittings are suitable for replacement of and old toilet seat hinges, helping to stop toilet seat keep stable The toilet seat fittings and fixtures universally fit for most standard toilet seat with top fixing hinges, the hole of toilet seats from 14 to 16mm Please check the detail size of each toilet seat expanding nut on the picture Simply push the toilet seat fixings into the toilet installation hole and tighten it with a screwdriver to make the toilet lid no longer loose You will receive 4 pairs / 8 pcs toilet seat screws, rubber and nylon to meet your different toilet fitting and bathroom