Armaspec Fulcrum90, Full Throw Ambi Safety Selector, Fits AR-15, Anodized Finish, Black ARM211-BLK The Armaspec FULCRUM-90 is an ambidextrous 90 degree safety. Its easy to reach levers and incredibly smooth action makes position selection a natural" fluid movement for the operator while having a super crisp lockup" leaving you no doubt about your safety status. Once installed" the FULCRUM-90 operates easily from either side of the receiver for intuitive use in the field by a variety of shooters in any circumstance.