Hawke Sport Optics Weaver Rail Adapter - 2 Pieces 9-11mm Black. These Hawke Optics scope bases will mount to virtually any 9-11mm rail with sturdy repeatability. Hawke Optics Airgun Rail to Weaver Rail Adapters open up a whole new category of weapon accessories to your firearm since Weaver-style scope bases are capable of mounting a huge variety of accessories. Hawke Sport Optics makes it easy to get the most of your 9mm to 11mm rails with the Hawke 2pc 9-11mm to Weaver Rail Adapter Kit. Specifications for Hawke Sport Optics Weaver Rail Adapter - 2 Pieces: Manufacturer: Hawke Sport Optics Finish: Anodized Fabric/Material: Aluminum Gun Model: Universal Condition: New Color: Black Weight: 0.9 oz Gun Rail: Weaver Features of Hawke Sport Optics Weaver Rail Adapter - 2 Pieces 2 Pc Adapter 3/8'' (Rifle) to Weaver Package Contents: Hawke Sport Optics Weaver Rail Adapter - 2 Pieces Hawke Sport Optics 22405: Weaver Rail Adapter - 2 Pieces 9-11mm Black