I especially recommend this seat because it is solid and well designed. In fact you can adjust the spacing of solid stainless steel screw of 135 mm to 170 mm, which allows to adapt the bezel-wc with any standard bowl. Metal and plastic washers are inserted here for more support. Easy to clean with a soapy sponge (however Avoid harsh products for safety because the product is coated with several layers). It is a pleasure for the eyes and a comfortable seat for all ages !!!! Try it and adopt it.