thats what they are !! you bolt it to the bow,you clip the release to the string and pull it back and it locks.then you just trip the release.it keeps it at full draw till you are ready to shoot.

Not leagl in most states,unless you have a handi-cap permit.

I am not a hunter I am a whitetail population reduction specialest

remember keep your back to the sun, your knife sharp, and your powder dry.