The PC-5 centre fin template is designed to fit into a single fin box allowing surfers to convert a traditional 2 + 1 longboard setup into a more contemporary thruster configuration. :: Unisex > Surf Accessories. Base: 4.37'' / 111mmDepth: 4.55'' / 115mmPerformance Core construction: Stiff. lightweight fin with a highly responsive\n tip flexSweep: 33 degreesArea: 14.76'' / 9525mm Size: one size.