Rest the Werner? 8-Foot to 13-Foot Aluminum Extension Plank between 2 ladders or on ladder jacks to have a staging platform that can hold up to 275 pounds. The Werner extension plank is made of extruded aluminum bars 2 inches deep£¬ with a platform consisting of extruded aluminum cross members riveted to the bars. The 5-foot extension can be locked in at 12-inch increments£¬ and it opens and closes smoothly on molded plastic spacer guides. Positive stops keep the Werner aluminum extension plank from moving beyond its full extension of 13 feet. The end flanges are made of heavy-duty aluminum crossbars that are also riveted into place to give the planking additional rigidity. The flanges on the aluminum extension plank are open so that the cross bars can be secured with channel clamps on Werner ladder jacks. The extension plank is 14 inches wide and is weight-rated for 50 pounds per square foot.