These 14-inch wide aluminum scaffold planks have a 500 pound duty rating and Twist-Proof stage design. Slip-resistant decking minimizes paint and material build-up. Side rail is an I-beam design, 6-inch. Stages need support one foot from each end. Can be supported with stepladders or extension ladders and ladder jacks with a minimum duty rating of 250 pounds. Vinyl-coated end caps serve as hand grips and protect from sharp edges.