The Pro Series XL is an aluminum scope housing with the same great features as the original Pro Series scope, but with a larger 1 5/8" viewing area. The scope incorporates a precision 2nd axis leveling system, and is perfect for 3D competitions. Loosen locking screw and rotate the portion holding the level so shots show the same left-right impact points at all ranges. The scope is easier to use than the 2nd axis adjustments on the scope mounting block. It is so precise it can compensate for wind drift on outdoor field, target, or 3D courses. Add the optional Glow Ring (0413S3) and you can have an aiming point in blue, green, and red with 0.010, 0.020, or 0.030 fiber size. Instructions show how many marks you should move the rear of the housing to produce the needed change of impact at different ranges. To change the scope from right to left handed, simply loosen the 1/16 set screw on the level ring and rotate the ring 180 degrees. The Pro Series Aluminum Scope along with Excalibur Lenses continue to be a dominate force in target archery. With Super Scope, the benchmark for accuracy and durability has been set. The winning results confirm exactly what our research data has proven, that a scope with a quality lens and adequate light projects a clearer and brighter image.