. The nut is usually slightly loose in the cage to allow for minor adjustments in alignment.Cage Nut, #10-32, Steel, Not Graded, Zinc Plated Finish The cage has two wings that when compressed allow the cage to be inserted into the square holes in equipment racks, and when released hold the nut in position behind the hole.
.5/16"-18 x 3" Coarse Thread Carriage Bolts 4PK The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.