Material: The expansion nut is made of high quality stainless steel and nylon, which is used to fix the toilet lid and is durable. Set: the set of expansion nuts includes 2 × stainless steel screws, 2 × nylon expansion nuts and 2 metal washers. Screw size: 4.8 x 0.5 cm. Nylon stretch nut size: 3.7 x 1.7 cm. 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 will do our best to help you. Product Description * Specifications: Material : Stainless steel + Nylon Weight: 20g Stainless steel screw size: 4.8 x 0 .5 cm< /p> Nylon nut: 3.7 x 1.7 cm Disc diameter: 14 mm< /p> Colour: silver + white Scope of delivery: 2 × expansion nut set Due to the mounting angle and light, there may be a little color difference between the photo and the product. Please refer to the actual product.