The RC-4 and RC-6 Series Low Tunnel (row cover) Hoop Bender bends a perfect, 4 foot wide by 36' tall [RC-4] or 6 foot wide by 30' tall [RC-6], row cover hoop, using 1/2", 3/4", 1" EMT tubing (electrical metal tubing or conduit) or 1 3/8" fence top rail tubing. (+ or- depending on metal alloy).