Offering unparalleled security the unique D-Ring mechanism is a simple and highly effective way to strap your boards down. :: Unisex > Surf Accessories. FCS hard tube roof rackDurable. long lasting 600D PolyesterDesigned to secure 1-2 surfboards extending out across the tail-gate of utility\n vehicles / pick upsUnique D-ring mechanism - the most secure way to tie down boardsFits non-elliptical (square or circular) style racks Size: one size.