It's a hard toilet seat with a chrome hinge that's bound to get a lot of praise from friends and family. feature: colordurablestain resistanteasy to cleaneasy to install Specification: Color: E191-A1, E191-A2, E191-A3Hinge: Zinc alloy hingeTransparency: OpaqueSize: upper 43.5*36cm, lower 44*37. 5cmHinge distance: maximum 20cm, minimum 10cm (please check carefully whether your toilet hole distance is within this range) Weight: 2.5kg 1. Check the shapeSuch as U, O, V, square2. Measure the sizeAfter checking the shape, the size is common. The toilet seat has U, V, O, square. U and V type are suitable for most toilet seats. Type O is old. There are very few square ones, its shape is noticeably bigger. The new toilet seat is usually a little smaller than the original, because only the original size is the same, and a slight deviation in size does not affect normal use. The edge of the long toilet seat is V-shaped, the edge of the short toilet seat is rounded and U-shaped, and the old toilet seat is oval and flat O-shaped. The toilet seat is not original and cannot be 100% matched, 3cm size deviation will not affect the installation, if you are perfectionist about it, please think twice before placing an order. Notice: 1. Hole spacing, standard 15mm, less than 10mm installation is difficult2. Pay attention to the distance from the hole to the water tank, too close to the opening of the toilet seat will affect it.