Hawke Sport Optics Weaver/Picatinny Rail Adapter - 1 Pieces 11mm Black. These Hawke Optics scope bases will mount to virtually any 11mm airgun rail converting it to a Picatinny/Weaver-style rail. Hawke Optics One Piece 11mm / 3/8in to Weaver & Picatinny Rail Adapter opens up a whole new category of weapon accessories to your firearm since Weaver and Picatinny 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 Single Piece Weaver / Picatinny Adapter Mount. Specifications for Hawke Sport Optics Weaver/Picatinny Rail Adapter - 1 Pieces: Manufacturer: Hawke Sport Optics Finish: Anodized Fabric/Material: Aluminum Gun Model: Universal Condition: New Color: Black Features of Hawke Sport Optics Weaver/Picatinny Rail Adapter - 1 Pieces 1 pc adapter 11mm (Airgun) / 3/8 (Rifle) to Weaver / Picatinny Extended Package Contents: Hawke Sport Optics Weaver/Picatinny Rail Adapter - 1 Pieces Hawke Sport Optics 22401: Weaver/Picatinny Rail Adapter - 1 Pieces 11mm Black