Material: The expansion nut is made of stainless steel and high quality nylon, which is used to fix the toilet lid and is durable. Set: The expansion nut set contains 2 × stainless steel screws, 2 × nylon expansion nuts and 2 × metal washers. Screw size: 4.80.5cm. Nylon expansion nut size: 3.81.4cm. Washer diameter: 14mm. Warm reminder: Please confirm whether the size is suitable before purchasing. If you have any questions about our products, please contact us and we will try our best to help you. Shipping quantity: 1pair/2pcs