Phase 5 Weapon Systems Ambidextrous 90-Degree Safety Selector, Black Anodized Finish, Levers are Machined from 6061-T6 Billet Aluminum, Central Core is Machined from Carbon Steel SAFE90-BLK 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.