RowTunnel, 8ft long hoops for Greenhouse, Plant Cover &Frost Blanket For Season Extension Support with clear plastic film covering, 20-Pack Never rust tunnel hoops, hoop house support for frost protection in winter Design for plant covers,row cover, frost protection cover and mini greenhouse 1pc of 8ft long hoop is jointed by 2pcs of 4ft long hoops and 1pc of ferrule arch span: 31"~63", approximate arch height: 23"~31" 1/4" inch diameter by 8ft, pack of 20