Features 1. High quality fixed well nut/toilet expansion bolt kit. 2. The kit is of high quality and even includes a top gasket. 3. High quality fasteners will firmly secure your top mounted hinges and seats, and will not be mistaken for cheap products. 4. The fixing components are sufficient to secure a top fixed toilet or bathtub seat. 5. These products are very suitable for blind installation embedded and wall backed toilet bowls, as it is difficult to easily find the toilet bowl hole from behind or below in this situation. Specifications Material: Rubber+Stainless Steel Rubber+Stainless Steel Bolt size: M6 x 50mm M6 x 50mm Gasket size: M6 x 18mm M6 x18mm Rubber accessories with dimensions of 40mm in length, 13.5mm in width, and 21mm in flange Applicable aperture: 14mm -18mm Package Include: A pair of Toilet Seat Fixing Fittings