This Windage Spacer Block installs between the extension bar and the elevation/windage adjustment block on all Option Sight Models. This Block gives an extra 1/2" of windage adjustment when the extension mount is inserted into the thru hole in the Mathews V3X Riser. This part is only needed for this bow model at this time. Option Archery Windage Extension Block w/Longer Screw for 2022 Mathews Thru Riser Mount OS-Windage-Spacer-Mathews