Raises eye level for proper alignment of optics - Provides a comfortable cheek weld when you use optics - Installs instantly on most collapsible stocks - No tools required snaps into place - Made of rugged fiberglass reinforced polymer to withstand harsh tactical conditions - Can be positioned along length of stock to provide optimal eye relief - 1.875 oz - 3.8x2.12x1.875 - Fits: - Fits most AR15/M16 collapsible style stocks with fins