High quality materials:: The expansion nut is made of high quality stainless steel and nylon, which is used to fix the toilet cover and is durable. Size:: The length of the screw is 4.5cm / 1.77inch, nylon expansion nut size is 3.8 x 1.7cm / 1.49x0.67inch, washer diameter is 14mm / 0.55 inch. Set:: Expansion nut set contains 2 × stainless steel screws, 2 × nylon expansion nuts. Utilities:: A sturdy fixing kit, reliable and sturdy designed for toilet bowl fasteners. Applies to:: Screw toilet seat hinges Ideal for broken or old toilet seat hinges. Fits most toilet seats standard with top hinge.