Sightmark 30mm/1 inch Medium Height QD Mount. This Rifle Scope Base from the professional product engineers at SightMark is made using incredibly durable materials that are guaranteed to be long lasting reliable and efficient. For a great way to make sure you have a great way to secure your optics choose the Sight-Mark QD Scope Mounting Base. Make your Mark. Specifications for Sightmark 30mm/1in QD Mount: Manufacturer: SightMark Width: 31 mm Fabric/Material: Aluminum Color: Black Finish: Matte Condition: New Length: 40 mm Included Accessories: Weaver Picatinny mount Reduction inserts for 1 in diameter Additional Features: Quick detach weaver/picatinny mountReliable and durableLightweightProvides return to zero after removal Tube Diameter: 30 mm Ring Height: 1.1 - 1.4 in Fit: Rifle Gun Rail: Picatinny Gun Type: Rifle Quantity: 1 Diameter: 30 mm Features of Sightmark 30mm/1in QD Mount: Covered by the Sightmark Limited Lifetime Warranty Package Contents: Sightmark 30mm/1in QD Mount Sightmark SM34002: 30mm/1 inch Medium Height QD Mount