20.7 Upward Compensation at 30 Yds Works with Most RWS Diana Break Barrel Models Tapered Design for Upward Compensation Recoil Stop Shoulder and Stop Pin to Prevent Bi-directional Recoil Three High Strength Screws to Ensure Solid Locking Converts RWS Airgun Rail to Picatinny/Weaver Rail for Most Versatile Accessory Applications 12 Picatinny Slots on Top Rail to Provide Flexible Eye Relief Adjustment Reversible Side Plate to Fit 9mm 11mm Airgun Dovetail with Tight Tolerance Milled Base to Accept Filler Screw on Rifle