The Phase 5 Ambidextrous 45-degree safety selector is compatible with AR-15 and AR-10 / LR-308 weapons. The SAFE-45 is interchangeable and can be configured for right or left-handed shooters.They highly recommend using a small drop of semi-permanent "BLUE" Loctite when installing levers. FeaturesProudly manufactured in the U.S.A., with U.S.A. sourced materials.Drop in Ambidextrous replacement for standard Mil-Spec safety selector.Designed with wide levers for ease of use.Levers are precision CNC machined from lightweight 6061-T6 billet Aluminum.Center core is precision CNC machined from carbon steel and then heat treated.Short-throw 45-degree safety that allows quick manipulation of the safety selector. Package includes(1) 45-degree throw center core(1) Long lever(1) Short lever(2) Torx screws(1) Torx Wrench