TruFire Hardcore 2.0 Release Buckle FoldbackTruFire Hardcore 2. 0 Release Buckle Foldback 30 percent smaller for improved fit and feel; Open hook design for quick, easy attachment; True Center Technology eliminates string torque; Nickel boron coated hook for reduced friction and better accuracy; 360 degree rotatable head with nearly 1"" length adjustment; Micro adjust travel and pressure for personalized trigger settings; Interchangeable trigger system: swept back, curved, knurled post, or 2