Leupold DD 1-in High Ext MatteLeupold trademarked Dual Dovetail™ system provides a classic low-profile mount for scopes on a variety of popular actions. Bases accept all Leupold rotary dovetail rings. Dovetail connections at both front and rear provide a rock-solid mounting platform.Height (in)0.90RingDiameter (in)1.00RingDiameter (mm)25.40Forged and Machined steel construction.Versatile, and available for many different rifles.Maximum Accessability (2 pc. Mounts)2 Piece Bases (Mounts)Leupold’s® trademarked Dual Dovetail™ system (DD Mounts)