The Pico-Rack was developed to provide firefighters and other emergency workers with a compact, safe and durable personal escape descender. All stainless steel with movable bars that do not swing open. Accepts personal escape rope from 7.5 mm to 9 mm diameters. Rope threads down through the device and then back up to the top, using both sides of the bars. A great device highly recommended for simple, effective emergency escape. Strength 11,000 lbf. (48 kN). Weight 4.5 oz. (127 g). Made in the U.S.A.