This Quick Detach Mount from Trijicon is one piece and is designed to be used with a 1" diameter scope tube. This mount with place the optical axis of the scope at 1.575" above the base. The mount is adjustable for eye-relief and the mount can be quickly removed/attached using Trijicon's patented BLAC™ quick release lever. Includes 1 mount, 2 , mount screws, and 8 ring screws