SightMark Low Height Tactical Mounting Picatinny Rings 30mm/1inch Black. With a matte black non-reflective finish these lightweight rings are constructed to fit both Weaver and Picatinny rails. The Sightmark rings come packaged with a hex key and reduction inserts for optimal adjustments. Specifications for SightMark Tactical Mounting Picatinny Ring: Manufacturer: SightMark Finish: Matte Tube Diameter: 30 mm Ring Quantity: Pair Quantity: 2 Ring Type: Weaver Fabric/Material: Aluminum 6061-T6 Condition: New Weight: 11.2 oz Color: Black Mount Type: Weaver Attachment Type: Weaver Picatinny Gun Type: Rifle Features of SightMark Tactical Mounting Picatinny Rings: Covered by the Sightmark Limited Lifetime Warranty Package Contents: SightMark Tactical Mounting Picatinny Rings SightMark SM34005: Low Height Tactical Mounting Picatinny Rings 30mm/1inch Black