RowTunnel,12ft long Hoops for Row Cover Grow Tunnel Support,Plant Cover &Frost Blanket For Season Extension Support, 40-Pack Never rust tunnel hoops Easy quick hoops for row cover,plant covers and frost protection cover support Use hoops to support garden row covers, protecting plants from frost 1/4"*12', pack of 40, 1pc of 12ft long hoop is jointed by 2pcs of 6ft hoops with 1pc of ferrule Arch Height: 21"~35", Arch Span: 57"~90"