Sturdy aluminum plank for use on ladder jacks, trestle ladders, and walkway applications. Made of 2" deep box section extrusions that extend up to 13'. Extruded cross member is riveted with solid aluminum rivets. Positive stops prevent over extending. Molded thermoplastic spacer guides provide easy open and close action. Heavy end flange/handles give rigidity and ease of operation. Outer flange is open for ladder jack clamps. Locking mechanism sets the plank in 12" increments. Specifications: 1 person, 250 lb rating; 8' closed position; 13' open position; 14" wide; weight 40.5 lb; inner rails 1-1/8" x 2"; outer rails 1-7/8" x 2". When assembled as scaffold or staging, these planks must be used in conjunction with suitable guard rail protection in compliance with applicable governmental codes and regulations for safe practice.