The PA200 Series aluminum extension planks are ideal for use on stepladders, telescoping multi-ladders, extension trestle ladders and extension and single straight ladders equipped with ladder jacks. Positive stops on the plank prevent overextending. Molded thermo-plastic spacer guides allow for easy open or close action. Made of 2 in deep box section extrusions. Heavy end flange or handles for rigidity and ease of operation. Outer flange is open for ladder jack clamps. The extruded cross members are riveted with solid aluminum rivets. Locking mechanism sets the plank in 12 in increments. 250 lb load capacity.