I bought 2 sets of 56" drawer slides for a van conversion and am disappointed. Because they are so strong and labeled as "Heavy Duty" it's ridiculous that this little metal spring fell off almost immediately. I tried putting it back in the clasp but it doesn't work. Now I'm stuck with open van doors until I can fix this thing or I have to take the whole shelf off the rails. They worked great on another set of drawer slides. Then, out of nowhere, they stopped opening. I have contacted the seller and will let you know if anything changes. I just need to fix it ASAP as I will be going cross country soon.