I had the old metal bases on my original kennels. They rusted out after about 5 years. These ones will not rust! They also made it easier to install with the knobby part in the middle. Simply use the measure-stick and set it on the knob for the perfect length. One thing to note: THEY ARE A DIFFERENT HOLE-PATTERN! I had to drill new holes to get these feet to fit. It was a pain - but I think it is worth it as these should last a LOT longer!