The Hydra HPS-6CA and HPS-L90 come standard with Hydra steel wall pool kits with 6" radius corners.
The corners for steel swimming pool kits come in 3 different size radiuses: 6" radius, 2' radius, and 4' radius. 2 foot and 4 foot radius kits have panels to create the proper radius turn.
6" radius kits have an insert to create the radius against 2 straight wall panels which are butted together at the corner.
The process of installing these 6" radius Corner Assist Brackets is shown here: