This is a special adapter designed to allow Hydrobats to fit on wheel heads with bat pins spaced 9" apart (Older Ci wheels) / (Standard wheel heads have bat pin holes spaced 10" apart). The adapter is made of a sturdy plastic and has two holes laser cut 9" apart allowing the adapter to fit onto your wheel head. Two bat pins are thread into the top of the adapter at 10" apart, allowing for the use of 12.5" and above sized Hydrobats.
The Adapter comes with additional holes spaced 6" and 4" apart so you can use this one adapter for every size Hydro-Bat available.