31" x 8" Deluxe Heavy-Duty Stainless Steel Knee Boards are made of #16 gauge stainless steel. The 31" x 8" contoured sliders prevent digging into the concrete. Polished stainless steel reduces the risk of corrosive problems on these heavy duty kneeboards. These reinforced, durable sliders are easy to use to protect your concrete while finishing. Toe bracket secures the foot and allows for an ease of back and forth movement along the work surface.