These machined solid steel bases create a secure mounting solution. Bases are a building block of an accurate shooting system. Properly aligns your scope and anchors it to your gun Complements nearly any hunting rifle platform 2-piece design Strong and lightweight Reversible style available for long scopes with large bells or for short scopes; allows the front ring to be set 0.850 in. farther forward or rearward Backed by the unconditional Burris Forever Warranty