The Challenger has been designed as a lower-cost choice for the archer who might sacrifice some of the features of the top-of-the-line Supreme sight, but still wants Sure-Loc quality, accuracy and dependability. It features a one-piece frame and convenient locking knob that also provides rapid travel for elevation. The sight features a true micro-adjustment of .002" increments for both windage and elevation. Like other Sure-Loc sights, the Challenger is compatible with all Sure-Loc accessories.