February 23, 2020
There are way too many to name. Like, there are hundreds of rappel devices. A few examples are the Kong Robot and Hydrobot, Conterra Scarab, all the old versions of rappel devices that are on there, and that one that has one big circle that always pops up on facebook.
If you want to see tons of rappel devices go to Dr. Gary D. Storrick's Vertical Devices Page