This Plastic Mounting plate (made in WA) is designed to be light strong and stiff. Used as a replacement for broken rudder mounts or to replace a heavier third party (Floppy) metal model This screws directly into the flush mounted brass threads in the back of Spirit skis (kayaks) that typically come with a rudder (e.g. CTR, PRS etc.)
Note that this is similar to the Finn model but they are not compatible as the holes are not the same distance apart (Finn Gudgeon plate is longer too). Please buy the model for your brand of kayak the holes are reinforced and not able to be re drilled in a different position.