Heinie Kimber Ledge all black rear sight offers the same great sight picture as all Heinie's sights. The Ledge design offers enough material for one-handed clearance drills but is still conceal carry friendly. The rear notch width is .156 for fast acquisition of the front sight. The Heinie Ledge can be paired with any Heinie-Kimber front. FeaturesDesigned for easy one hand cyclesQWIK notch width of .156"Rear sight serrations help eliminate light glareNotch Width: .156"