Product Description The KR Strikeforce Power Rev 3 features an extended index finger to accentuate the wrist rotation through the release to create increased length and back-end hook angle by creating more side roll. Lateral adjustments allow your hand to be in position to alter the amount of forward roll and spin on the ball. Four forward cup positions to choose from. Please note that the Pro Rev 3 is identical to the Robby’s Rev III, it has been rebranded to the KR Strikeforce brand for the 2021 fall bowling season.