Precision machined from Aircraft Aluminum and black anodized finished, The UTGA(R) ACCU-SYNCA(R) 45 Degree Angle Flip Up Rear Sight is a great choice for a back up battle sight. No need to co-witness with a primary optic, the 45 degree angled offset positions the sights off of the optic plane. The Posi-lock retention detent prevents the sight from collapsing when in use. The Windage Adjustment Wheel provides a tool free adjustment of the dual aperture sight. &