Here is a quick video I made showing how I installed a 60” Rigid Job Box tool box into the bed of my truck using 1/4” x 2” long bolts with nuts and washers.

Position box in bed of truck

Mark holes

Remove tool box

Then drill the holes

Then put the tool box back back in and insert bolts into pre drilled holes. Then attach the nut and washer to the bottom of the bolt.