The C&H Kahles Parallax Spinner for the Kahles k624i, k525i, k318i, and K1050 was custom designed in conjunction with Kahles and Team Kahles PRS Shooters. Our design is optimized for both left-handed and right-handed shooters to provide maximum efficiency for dialing the parallax. When installed properly, both the indicator mark above the spinner and the parallax number below the spinner will be visible to the shooter. The parallax spinner is attached to the scope using three set screws. It is a must-have for any Kahle's scope owner. Disclaimer: some pictures with the scope are from the pink prototype, we offered all these spinners in black.