Excellent material: Black rubber (stretchy ball) / ABS plastic (round cards) / stainless steel (screws). Constructed of sturdy metal hinges and screws, better than most plastic jigs. Rubber Plugs: The rubber plugs slide perfectly into the holes and when you tighten the screws they squeeze into the holes for a good tight fit. Non-rust washer: Supplied with 4 soft plastic washers. Plastic discs do not rust, better than metal discs. When tightening the screws that push the washers into the holes, you must be careful not to tighten the screw so much that it pushes through the washer. Size: Expansion ball diameter: Approx. 1.7 cm (unexpanded state). Length: Approx. 4cm / 1.57in. Suitable for 14 - 16 mm hole. Universally suitable: Suitable for 14-16mm hole for 2 toilet seats. Ideal for broken or old toilet hinges. Fits most standard fixed hinge toilet seats. Note: The data are all measured manually. Please allow an error of 1-3cm. Due to the difference between light and display, there is a certain color difference, which depends on the actual object received