Digger mats feature a cable from the top of the mat for dragging the mats into position, typically with an excavator. Sometimes if the mats are used as just support mats (like a Crane Mats) the mats can be flipped over and the cables are out of the way on the bottom side. These mats are going up north to a challenging muddy site. The bottom photo is of conventional Crane Mats (no cables)