The lock that was included was not long enough to go through the stainless steel bars and the "Adaper For Front Tackle Box". I went to Home Depot and picked up the lock pictured at the left.
This lock has a shackle diameter of 7/16". Which is a tight fit in the ½" holes that are drilled in the stainless steel pipes and the "Adapter For Front Tackle Box". At first I had to use a hammer to knock the lock through the holes. But after just a few times all I have to do now is to line up the holes and bump the lock with my hand to knock it through the stainless steel pipes and the "Adapter For Front Tackle Box".