We used these clips to secure the Christmas lights on our patio. The clamps were on a 5/4 deck plank that is part of the railing system. (A 5/4 deck is 1 inch thick.) The clamps held securely for about six weeks when we had the lights on. I could not mount the clamps on 2" nominal wood (1.5" thick). They may have stretched, but I didn't want to put too much strain on them (in the cold). Not a single clip broke and not a single clip lost its hold. I was pleased with the performance of these clips.
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