I needed to replace the wheels on my home's sliding gate and wanted a stainless steel wheel that could be easily removed for maintenance or to have sealed bearings. This 3" wheel block meets my criteria and isn't in the wallet! This H-slot wheel is high quality at a good price. Wheels and bracket are stainless steel for durability. The wheel is supported by a stainless steel axle with a Retaining ring retained on each side.Sealed bearings can be easily removed by hand for easy maintenance.Sold as a set and sourced from "WUHAN, CHINA" If you don't mind the monthly wait, this is a great deal.