single strand two loop lanyard
I have no tool belt but needed to have a hammer handy for a project. My regular belt goes through the top loop.
The loops can be made any size.

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The hammer carrier has fixed loops that are locked in place.
The loops can be made adjustable so they can tighten against any object.
The loops will remain in place until the center knot is purposefully moved.

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Here are step by step instructions for making this knot
lanyard tutorial