The TruFire Thor Hammer Throw Release is convertible to either a 3 or 4 finger version by simply removing a screw. It also has multiple position trigger for customization, but what really sets it apart is the inside noise dampening material that keeps it from having the infamous "Ping" that hammer throw releases are known for. Adjustable trigger pressure and travel make it the ultimate hammer throw release.
I have been using hand held releases for years. To simplify things I have been using Tru-Fire releases since I began hunting. This release is great great adjustability and very quick. The 1 and only downfall I see about the Thor is the 4th finger is loose and you can't tighten it down all the way. I shoot both 3 and 4 finger releases so it's not that big of an issue for me. The 4th finger is nice but I prefer the Thor as strictly a 3 finger release. Go a head and buy one you won't be disappointed.