Freedom Rings are milled from 7075 aluminum and hardcoat oxidized, so your AR-15 receivers and your scope rings are made of the same stuff, with the same scratch resistant finish. No slipping, no shifting. Freedom Rings get the job done at a price that’s accessible for the every day working American. Pricing for 1 paired set. 7075 Aluminum Construction Scratch Resistant Hardcoat Oxidized Finish CNC Machined, Precision Matched Pairs T10 Star ring cap screws: 10 inch-pounds torque 1913 MIL STD Picatinny base screws: 30 inch-pounds torque Diameter : 30mm Centerline Height : 1.10”