HowNot2's Ryan Jensk is known for his material testing. In this video he examined how a carabiner with self-drilled holes behaves in the breaking load test.
There are various carabiner models on the market that are provided with cutouts. The reasons are of a functional nature, serve to reduce weight or for visual differentiation.
What happens if you drill holes in the carabiner yourself to reduce its weight, anyone can think. The following video is still impressive.
How does the breaking strength of a punctured carabiner change?
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Credits: Cover picture Ryan Jenks/HowNot2