I had bought sets of Klug drawer slides as they were easy to install and easy to remove the drawer once installed. However, they are made of flimsy material and they were destroyed in no time. So I tried the equivalent Vevor product, which was cheaper but more difficult to install and you cannot remove the drawer once installed. The drawer slides are much more robust, quieter and have a locking device. The finished job is much better and I have confidence that they will last for a long time. The other downside is the fixing instruction leaflet is next to useless.
So, in my opinion the Vevor product is superior to the Klug more expensive product. Well done and thank you.