The HS Plunder 6 Inch Twin + 1 fin by Futures Fins and Hayden Cox of Haydenshapes Surfboards is extremely versatile. It pairs perfectly with mid length surfboards and single fin shortboards.
Designed specifically for use with the Haydenshapes Plunder model, The Plunder 6 Inch single fin can be ridden as a single fin only or as a single fin with a side bites. This fin template gives you a flowing feel with plenty of pivot around the fin for easy directional changes and quick turns. If you're looking for a little extra speed and drive you can use the side bites which also give the board more of a thruster feel but with the feel of a traditional single fin setup.
This fin is also available in a 7 inch size, check out the HS Plunder 7 Inch Twin + 1