When and where is the best use of locking carabiners on an anchor? On the gear or bolts? On the masterpoint? Is it a multi pitch anchor, or a toprope? Can I use lockers on “half” of the anchor? It's a contentious and important discussion, so let's take a look.
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https://www.alpinesavvy.com/blog/snapgate-or-locking-carabiners-on-anchors