The Wheeler MSR Cantilever integrated rings and base mount is a 6-hole tactical design with integrated anti-cant indicator. The 2" extension allows the shooter to mount the scope at a comfortable distance for proper eye relief. The swing out anti-cant level helps keep the reticle level while shooting at distance.6061 aluminum2" cantilever extension6-hole ring design with retained 1/2 inch lock nuts that secures to the picatinny railSwing out anti-cant levelIncludes torx screws