The Spuhr 1 Piece Hunting Scope Mount is designed for use on Picatinny rails and features one classic ring and one interface ring, which can be rotated as to position the interface/accessory in either the 12-o'clock or 3-o'clock position. The SCP-series of mounts can also be rotated for left or right handed shooters, and features two separate side clamps. 10-degree wedge included.