I bought these because I needed to lower the tool cabinet behind my table saw by half an inch to allow the boards to be cut to fit over the top of the cabinet. The 2-1/2" locking casters replaced another brand of 3" locking casters. The new 2-1/2" casters are easy to install thanks to the same base plate size. Compared to the excellent previous rollers, the new rollers have better insert accuracy and look and feel very good. and are a pleasure to use. Although the reel diameter is half an inch smaller, the new Casoter reels roll even easier than the previous 3 inch reels. The smaller diameter wheels on the new reels are also much wider and this more than offsets the ease of rolling with the smaller diameter. These are some of the best reels I have ever installed. Highly recommend.