JINYI Universal Toilet Seat Hinges Screws, Replacement Bolts Expanding Rubber Top Nuts Screw, Fit for Fixings Fix Blind Hole Fittings - The toilet seat screws and fixtures are made of rubber, plastic and stainless steel, sturdy and durable. The strong metal hinges and bolts, better than most plastic fixtures on the market. WELL MADE MATERIAL - The rubber bungs have a brass nuts inside which can antiskid and antirust. You don't need to tight screw from bottom with these toilet seat hinges screws. These rubber toilet seat bolts provide great friction against the ceramic bowl holes therefore excellent grip compared to plastic. SOFT RUBBER BUNGS - The rubber bungs will slide into the holes perfectly when you tighten the bolts, they squash up in the holes to make a good tight fit. Please do not over tighten the bolt. EASY TO INSTALL - Screw the toilet seat hinges into the top hole of the toilet lid, and tight that to make the toilet lid will no longer be loose. The rubber grommets have a threaded section so you can just push them into the holes in the top of the toilet pan and when you tighten the screw it expands and tightens itself into the hole, without the need of a bolt on the other end of the screw. Colour: Black Size: as shown Quantity delivered: 8 pieces Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.