Sightron SIII8 32x56mm Tactical Elevation Knob 29 MOA Black MOA. The etched markings on the knob indicate a 29 MOA engraved elevation value. When changing the knob to a different value simply turn the knob to obtain the next highest elevation value shown. Then perform the desired adjustment and lock the knob into place. This Tactical Turret is quick and easy to install and offers an extended elevation knob life due to the fact that the extra-long knob shaft has been designed to withstand extended torque loads without damage to the mechanism. Specifications for Sightron SIII8 32x56mm Tactical Elevation Knob 29 MOA: Manufacturer: Sightron Color: Black Features of Sightron SIII8 32x56mm Tactical Elevation Knob 29 MOA Tactical Elevation Turret 74002 1/4 MOA Click Value 29 MOA Engraved Compatible with: SIIISS832X56LRMOA SIIISS832X56LRIRMOA SIIISS832X56LRMOA-H SIIISS832X56LRIRMOA-H For A Compatible Tactical Windage Turret See 75002 Package Contents: Sightron SIII8 32x56mm Tactical Elevation Knob 29 MOA Sightron 74002: SIII8 32x56mm Tactical Elevation Knob 29 MOA Black MOA