Petzl Tibloc - Everything you need to know — Alpine Savvy
Petzl highly recommends that the TIBLOC is used with round profile carabiners, but they suggest the hole on the S'MD carabiner (NOT round C-section) is for loss prevention of a TIBLOC. What
Petzl Tibloc - Rock+Run
Petzl Tibloc Ascender | REI Co-op | Survival equipment, Rings for men, Silver