Compatible with hinge and button style releases made by all brands including ULTRAVIEW, TRU Ball, Scott, Carter, Tru-Fire, B3, Spot Hogg, etc.  Comes with all hardware needed, 8-32, 6-32 and 5-40 mounting bolts and 6-32, 5-40 nuts.  It will not mount onto STAN Hinge releases. Use it as a thumb peg on your hinge or a thumb knob on your button. The most aggressive knurling you can achieve on a thumb peg - ensuring you get the grip you're looking for.  ULTRAVIEW's pioneered through-hole design of the peg allows the mounting bolt to be inserted through the whole peg, and into your release to provide a wide range of compatibility and added strength. 100% Proudly Made in the USA.