Have done this as a gift to a friend.
It's nice to hide your house keys outside.
Used 1" x 3" bolt
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Put your spare truck key in it and pitch it into the box along with all the other detritus.Nice work, and it would be great on a farm or an industrial site where it would fit the location, but a 1" x 3" bolt laying in a flower bed or on the sidewalk by a house in an urban environment would look way out of place.