Mizugiwa 11MM Dovetail - 20MM Weaver Scope Rail Converter Adapter for Airgun or Rifle Change your standard 11mm Airgun/Rifle Rail to 20mm Weaver Finished in Tactical Matt Black, complete with Allen Key. This mount has a removeable Weaver rail so can be used as an 11mm riser for extra height. Length = 70mm,Width = 24mm,Height = 20mm,Weight = 80g Converter Adapter 11mm - 20mm