The Phase 5 Ambidextrous 90 Degree AR-15 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. They highly recommend 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