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 - Everything you need to know — Alpine Savvy
Petzl Tibloc - Everything you need to know — Alpine Savvy
TIBLOC - Ascenders | Petzl USA
Petzl Tibloc set | Canyoning equipment package Newcomer | CanyonZone
TIBLOC - Ascenders | Petzl USA
Karabiners and Quick Links - KOALA Equipment
Petzl Tibloc set | Canyoning equipment package Newcomer | CanyonZone