First, if you receive two slides that work properly and are not damaged in the packaging, you are probably on your way to a better experience than me. I ordered two sets of slides and one of the slides in one set was damaged and preventing the slide from opening or closing properly. I attributed it to a random slide so I ordered another set and planned on returning the defective set. Today I got a new set of slides and lo and behold, one of the two slides in the drawer was broken. This time the shutter didn't open at all. In the image I've attached, the right slide is a first-order error and the left slide is a second-order error. None of the slides work so this product gets a thumbs down from me. I installed the first slides and they work fine. In my opinion you can spend about $5 more on a set and get a better quality slide that works right the first time.