Review on Fusion Climb Release Strength Pull Lock by Edgardo Ennis

Exactly what I was looking for. I attach this to a tether to pull the kids up the zip line and then I can release them from below to go down. (Not attached to the zipline, just a line to pull up) Relatively easy to release even under load. I'm guessing it takes about the 5th force to loosen the pin due to the load it's holding. The pin is spring-loaded (won't fall out) and the clasp closes without re-pulling in pain. The 18 kN strength rating is very reassuring. Looks like a real specialty but well done.