Dihedrals are molded connecters that pre-form a dihedral or keel in your Eddy or Diamond kite. Assemble your kite by inserting the spreaders into the angled channels, then insert the spine through the center hole on the dihedral We have them in smaller sizes for Eddy trains or in larger sizes for Diamonds or whatever needs a dihedral. Dihedrals are available in 4 different inside diameters for different rod sizes. Each is pre-molded to the proper angle to form a dihedral for small to medium sized kites.