Extension length: 6" Materials and shape combine in polygonal carbon extension bar to offer incredible vibration damping results. Aids in a silent shot. Quick change front block perfect for archers who use multiple scopes. Rock solid connections for exceptional reliability. Increased range of windage adjustment over other Shibuya models. Mounting system maximises contact with the extension bar for a more secure hold. Included metal sight plates give a choice of 16 scale options. The ULTIMA CP PRO 3D & target compound sight combines the proven features of the ULTIMA CPX series sights, with the brand-new polygonal extension and Advanced Lock Mechanism found on the RC PRO sight. The polygonal extension shape, combined with high modulus carbon material, eliminates 80% of initial shot vibration*. The circular chamfer on the mount lock provides a more secure lock and repeatable aperture distance setting than ever before!New to the ULTIMA CP PRO are laser-engraved sight mark plates, which can be mounted in recessed slots on both sides of the 4” elevation bar. 15 scales and one blank plate are included with each ULTIMA CP PRO.In addition, the ULTIMA CP PRO includes, for the first time in ULTIMA history, a front detach block. The detach mechanism is comprised of two “teeth” featuring a polygonal dovetail, holding the windage unit perfectly tight from both sides.