Hawke Sport Optics Extended Weaver Rail Adapter - 1-Pieces 11mm Black. These Hawke Optics scope bases will mount to virtually any 11mm airgun rail with sturdy repeatability. Hawke Optics Single Piece 11mm Airgun to Weaver Adapter Rail opens up a whole new category of weapon accessories to your firearm since Weaver scope bases are capable of mounting a huge variety of accessories. Hawke Sport Optics makes it easy to get the most of your 11mm rails with the Hawke Aluminum 11mm to Weaver One Piece Rail Adapter. Specifications for Hawke Sport Optics Extended Weaver Rail Adapter - 1-Piece: Manufacturer: Hawke Sport Optics Finish: Anodized Fabric/Material: Aluminum Gun Model: Universal Condition: New Color: Black Weight: 110 g 3.9 oz Gun Rail: Weaver Features of Hawke Sport Optics Extended Weaver Rail Adapter - 1-Piece: 3 8 Rail 1 piece Configuration Quad Hex (4mm) Fixings (Rail) M5x0.8 Thread (Rail) Package Contents: Hawke Sport Optics Extended Weaver Rail Adapter - 1-Piece Hawke Sport Optics 22404: Extended Weaver Rail Adapter - 1-Pieces 11mm Black