This is an overview of the features and operational use of the Petzl Freino carabiner, which is my preferred carabiner for use with bobbin descenders such as the Petzl Simple and Stop. This is used as part of a rappelling/descending system for vertical caving.
Inner Mountain Outfitters: https://www.innermountainoutfitters.com/petzl-freino-braking-carabiner/
On Rope 1: http://onrope1.com/carabiners/screwlinks/petzl-freino-carabiner/
Karst Sports: https://www.karstsports.com/petzl-m42-freino-carabiner/
Caves are delicate and potentially dangerous places. For more information on wild caving, vertical caving techniques, and cave survey, visit the National Speleological Society website:
To find a local grotto (caving club) visit:
White Nose Syndrome (WNS) is a disease that is devastating to bats. To learn more about what you can do to help, along with information on how to properly decontaminate caving gear, visit: