The Phase 5 90-degree ambidextrous safety selector is compatible with AR-15 and AR-10 / LR-308 weapons. The SAFE-90 is interchangeable and can be configured for right or left-handed shooters. Phase 5 recommends using a small drop of semi-permanent "BLUE" Loctite when installing levers. FeaturesDrop 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.Same 90-degree safety that most shooters are used to. Includes:(1) 90-degree throw center core(1) Long lever(1) Short lever(2) Torx screws(1) Torx Wrench