Soft Surf Board Twin Fin Skeg Set Any Catch Surf, Wave Storm or Suftop Surfboard will fit these Surf Skegs. Perfect Soft Top Skegs Installation Tips: To install, you only need to punch four holes through your board and pop the screws through to connect with the skegs on the bottom. We highly recommend applying some dish soap to the screws before installing and screwing them into the skegs to avoid having the screw snap. (Note: This item is compatible with the classic Beater 48" and 54" boards and almost any bodyboard) Use a Quarter to screw the bolts Skeg length from front to back along the base: 6.75 inches Skeg height from base to tip: 4 inches Screw length: 2 inches Distance between centers of screw holes on skeg: 4 inches Twin Fin Kit Perfect for all Soft-top Surfboards This Twin Fin kit works perfectly for bodyboards, or with the CatchSurf Beater if you want to convert your finless Beater to a twin fin! We can email back a template to print out and lay over the bottom of your Beater board so you know where to punch the holes for the fins. Maximum board thickness these will work with: 2.75 inches If you have a board thicker than this, check out the SUP Skeg Replacement Kit on our site. Catch Surf Beater Convert you Board to a Twin Fin Easy to install Any questions feel free to drop us a line you can chat with us on the ebodyboarding website