RowTunnel,1/4"Dia, 8ft long hoops for Greenhouse, Grow Tunnel Support For Frost Protection,Plant Cover &Frost Blanket For Season Extension Support, 20-Pack,white Never rust tunnel hoops, hoop house support for frost protection in winter Ideal for row cover,plant covers, frost protection cover and mini greenhouse Much more quickly installation than pvc hoop Use hoops to support garden row covers, protecting plants from frost, insects, birds, or intense sun 1/4" inch diameter by 8ft, pack of 20,arch span: 31"~63", approximate arch height: 23"~31"