With customization and economy of effort in mind the 60/90 AMBI allows the end user the choice of selector switch degree to suit their personal shooting style. Whether you prefer short throw or a conventional selector switch lever; the SI 60/90 allows for easy configuration for strong side only or bilateral weapons manipulations. Features custom HEX design abd groove cuts for secure grip. Includes AR-HS-60/90-AMBI two HEX ambidextrous selector switch w/mount end cap and M3x6mm countersunk screws.