And Onerahi's batsmen didn't disappoint.
"We got off to a good start," said Onerahi allrounder, Henry Cooper.
"Brad Kneebone got 25, Tom Herman 16 and I ended with 35 not out."
Kaipara's bowlers proved challenging, however Onerahi's batsmen gradually got on top and it was their day to bask in glory.
Inside the 18th over and with a few wickets to spare, Onerahi seized the win with nine balls left in the innings.
After a challenging season for the Onerahi side, Cooper was upbeat about his side's finals win.
"It was absolutely bloody good," he said.
"We had a few players back so that helped with our consistency.
"We haven't gone that well this season in the other rounds and formats so to get this one is good for us moving forward."
In other games at the weekend, Kamo played Maungakaramea in the reserve grade T20 final and notched up a win inside the 19th over of the second innings to bring their season to an emphatic close.