Athlon Optics Precision Rifle Scope Rings 30mm MSR Ring Black. Designed for precision rifles including magnum calibers.A four screw ring cap design paired with a single nut base and recoil lug cross-bolt. A scalloped profile increases the surface area in the rings flex points while reducing mass ensuring these rings will hold your scope tight Specifications for Athlon Optics Precision Rifle Scope Rings: Manufacturer: Athlon Optics Finish: Type III Hard Coat Anodized Ring Quantity: Pair Quantity: 1 Fabric/Material: 6061-T6 Weight: 0.14 kg Color: Black Mount Type: Picatinny Gun Rail: Picatinny Country of Origin: USA Attachment Type: Picatinny Features of Athlon Optics Precision Rifle Scope Rings Steel Recoil Lug: Machined into the cross-bolt this ultra durable recoil lug eliminates ring shift in picatinny and weaver cross slots. 4- Screw Cap Retention: The optimum balance of weight savings and retention. Aircraft Grade Aluminum: Aircraft Grade Aluminum provide extra strength and durability to handle the toughest terrain and offers lifetime of use. Scalloped Design: Increased area across the flex point of the rings increases mating surface contact ensuring a no-slip lap free design. Hard Anodized Finish: Hard anodizing increases the rings durability and wear resistance. While producing a glare free matte finish. Package Contents: Athlon Optics Precision Rifle Scope Rings Athlon Optics 701004: Precision Rifle Scope Rings 30mm MSR Ring Black