I wanted to use the unused space in the base of my grinder. I was originally going to buy the standard 100lb 22" or 24" slides which are pretty cheap, but then I stumbled across these. I've gotten to the point in my life where I want things to last and get things done right the first time, so I make an effort. $150 for 3 sets instead of $30. Then I turned the leftover melamine I had lying around into boxes, ha ha! Until I had time to make metal boxes. Full extension STANDS. Would buy it again for the same project.