Aluminum Extension Plank is ideal for use on stepladders, telescoping multiladders, extension trestle ladders and extension and single straight ladders equipped with ladder jacks. Positive stops on the plank prevent overextending. Made of 2” deep box section extrusions. Heavy end flange/handles for rigidity and ease of operation. Outer flange is open for ladder jack clamps. Locking mechanism sets the plank in 12 inch increments. 250 pound load capacity.