These Blackhawk® Six-Hole Tactical 1-Inch Weaver Rings are machined from strong, lightweight aluminum with six screws for maximum security, clamping pressure, and added strength for serious LE and military use. A large locking nut secures them to Picatinny rails. These rings feature an improved Picatinny cross bolt design, Type III hard coat anodized finish and no strip/slip Torx screws. All of these features make these riflescope rings the go-to mounts for all tactical precision rifles. An installation wrench is included. The High Mount size of these rings will accommodate up to a 44mm objective lens scope. However, mounting a scope on an AR type rifle will also require ½” risers to raise the scope up high enough for a comfortable cheek weld and for proper view through the scope. Order Part Number MR-01 for these ½” scope risers – available elsewhere on our website.