The AXCEL RHEOTECH head on this sight includes the following features: *Hot, Quick-Adjust Rheostat Cover adjusts fiber optic brightness in seconds! Dial the rheostat up to eliminate the starburst effect when moving to bright settings like open fields and dial it down to make pins brighter in low light situations like deep woods. *Stronger, brighter CNC machined Firepins - with 18" of fiber per pin *Easy micro-adjustment for each individual pin. Simply loosen the screw in the pin you want to move, turn the adjustment knob to move the pin up or down, then re-tighten the screw! *True, separate 1st, 2nd, and 3rd Axis Adjustment in seconds. Once you lock one axis down, you can then adjust the other without losing the previous axis adjustment. *Solid, Easily-Visible Inside Scope Level from a top quality American source! *CCT - CoPlanar Centering Technology-Aiming ring at same depth as sight pins, designed for greater accuracy when viewed slightly off-center -Ambidextrous RH and LH -Micro-adjustable Windage and Elevation knobs *Sleek Gear-tooth Windage and Elevation Lock Knobs can be positioned where you want them to reduce snags on sticks and vines when trekking to your treestand or stalking in an open field *Sight light port (3/8"-32) allows you to add an AXCEL Sight Light or a light from any of the other great aftermarket light companies AXCEL PICATINNY IN-LINE MOUNTING BAR AXCEL Archery teamed up with Hoyt Archery for this new Picatinny In-Line Sight Mounting System. Currently available with Hoyt's flagship hunting bows (RX5 and Ventum), the Picatinny In-Line system is available in one of three configurations for our Top-Selling AXCEL Sights: 1)ArmorTech and RheoTech, 2)AccuTouch or AccuHunter, and 3)Landslyde sights. The main reason for choosing a Picatinny In-Line sight mount is so that you can mount your sight to the front of your bow for better bow balance and to free up the side of your bow for a quiver mount. In addition, the proven Picatinny mounting