I had one leaking transmission line on my 2006 GMC Sierra 1500 but decided to replace all three. I read the reviews here and did my due You Tube diligence. I saw all the videos about using a pick to remove the clips. I have good mechanical skills but thought this tool looked useful. I changed the lines today and found that a pick would work fine when there was room to get the pick in the right place. But where space was tight, I found this gizmo to be very helpful. If you look closely at the tool, you can see that one notch needs to slide into the “space” in the clip. One engaged, you just turn the tool slightly and the clip expands and releases the line. There is no need to remove the clip. Just remove the tool leaving the clip in place, clean inside the groove, then pop the new line back into the fitting. I found it particularly useful on the two lines that come from the side of the tranny, and the lower radiator line. All three of these connections are in very tight spaces, and even with the heat shield removed I found it difficult to get a good visual on the tranny lines. I am not the richest Amazon customer on earth, but for me, this tool saved me time and effort and was well worth the price. I would buy it again.