This Z-Loc is made to give the extended finger more rotation of the wrist during the release, generating increased length and backend hook angle by creating more side roll. The straight wrist position along with extended index finger support aids bowlers with inadequate side roll to create sustained hook and a greater angle of entry in the pins. Made up of constructed lightweight duraluminum, and allows easy removal. If you find yourself with painful wrist pains that restrict you from maintaining a consistent release, the Z-Loc is perfect for you.