For years Bo-Mar rear sights set the standard of which all other rear sights were judged, so why not make a fixed rear that uses that knowledge. Dave Dawson set out to improve on that and make the best fixed rear sight on the planet for competition and target shooting. The blade is back angled 3 degrees to reduce glare. The deep notch provides more visual reference for faster precise windage alignment. This also gives the shooter the advantage of tracking the front sight better during recoil and placement on target, for those tight hardcover shots. The serrations on the black sights are designed to draw your eyes to the HiDef sight notch, providing a clear, crisp sight picture, yet snag free on outer profile. Chamfered to break all sharp edges and not rub you the wrong way. The competition black .135 notch rear sight with .105 wide fiber optic front provide Dave Dawson the best focus for his average eyes and is what is on all of his Glock's.