Compatible with all hinge style releases made by all brands including ULTRAVIEW, TRU Ball, Scott, Tru-Fire, and many more... Based on the design of our insanely popular Helix thumb knob, the TriHelix was designed to lock into your thumb comfortably and consistently. Everyone that has tried the TriHelix has instantly swapped to it and once you try it, you'll be wondering why thumb pegs were not made this way to begin with. Comes with 1.25” long socket screws in 6-32, 8-32, and 5-40 sizes and will attach to all Hinge releases such as The Hinge, TRU Ball Fulkrum, Carter releases, Scott, B3, and TruFire - all hinges except Stan hinges. The through-hole design of the peg allows a 1.25" bolt to be inserted through it, and into your release to insure strength and rigidity even from high drops. Made in USA