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 expansion nut set contains 2 × stainless steel screws, 2 × nylon expansion nuts and 2 × metal washers. Screw size: 4.8 * 0.5 cm. Nylon expansion nut size: 3.7 * 1.7 cm. Washer diameter: 14mm. Warm reminder: Please confirm whether the size is suitable before purchasing. Specifications: Material: stainless steel + nylon Weight: 20g Stainless steel screw size: 4.8 * 0.5cm Nylon expansion nut: 3.7 * 1.7cm Washer diameter: 14mm Color: silver + white Package includes: 2 x expansion nut set