The Rescue U Rack has three (3) 1″ stainless steel hinged open back bars, two (2) 1″ stainless steel fixed open back bars and an aluminum double hyperbar. The stainless steel frame is 3/8″ in. diameter. The “Hyperbar” aluminum top bar is of great help when locking off. The 15 in. length gives you plenty of room to adjust the friction as required. Accepts ropes from 3/8″ to 3/4″. Works with doubled ropes too! Both must be same diameter. Made in the U.S.A.