Tenebraex Vortex Viper PST 2.5-10x44 Adapter Ring VV0044-AR serves as a unique and important accessory. It helps in attaching an array of accessories like ARDs or Flip Covers to the rifle scope. Built in compatibility with Vortex Viper PST 2.5-10x44 scopes, the black Tenebraex VV0044-AR adapter ring is to be placed at the objective end of the scope. Tenebraex Adapter Ring for Swarovski, Leica, and Vortex Scopes VV0044-AR