I bought this from Grip Sight Technologies
Just like sights on a bow. This thing sure has helped my accuracy. Not many places under a dock I can't put a jig now. I had no idea how many fish I had been missing under those floating docks with tiny gaps between the floats. Those fish are not used to seeing jigs up under there.
Once I got it all dialed in to the way I shoot I can can pick a spot under a dock and send a jig in there.
Turned My B&M Sharpshooter into a tack driver.