Badger Standard Rails XR - BlackThe strongest aluminum rails on the market for extreme performance Stainless steel inserts for all threads. 7075 T6 aerospace grade aluminum. Simulation optimized center geometry adds material where its needed and removes it where it isnt (like the center hole), giving improved bending resistance while saving weight (slightly lighter than stock rails). Access the inner hub bolts through the center hole with included 5mm ball end wrench.