Bright Four Pin Precision SetupThis sight features a 1.8 in ID aperture with 4 bright 0.019 in vertical pins for a clear sight picture. Micro adjustable windage supports fine tuning while the design adjusts for both left and right handed users. A glow ring illuminates the fixed level and the fixed bracket offers 3 mounting positions. 1.8 in ID aperture 4 bright 0.019 in vertical pins Micro adjustable windage adjustment Left and right handed adjustment Fixed bracket with 3 mounting positions