The trim addresses the lap joints and locks the boards in position to stop separation on uneven floor. The trim pack includes pre-drilled 3-1/four inch wide prime rails and corner moldings that attach into the raised bed with integrated screws. Our impressions from the Jumbl raised garden bed are that https://raisedwoodengardenbeds65453.wikibuysell.com/710515/the_greatest_guide_to_cedar_for_raised_garden_beds