Benchmade 490S Amicus Flipper AXIS-Assist Knife Satin Serrated Edge. This Benchmade's Amicus 490 is the first AXIS-Assist knife to utilize a flipper opener! Designed with everyday carry comfort in mind, it has a thin, lightweight 7075-T6 aluminum handle with a deep carry, reversible pocket clip. For an added measure of protection, Benchmade has included a front-mounted safety lock. Adding even more draw to the Amicus knife, is the super premium CPM-S90V stainless steel blade.