Solid steel body has a bright, fiber optic rod to give your eye a quick-to-focus aiming point for fast, accurate target acquisition. Brilliant orange or green rod is 9/16" long for excellent light gathering; provides an eye-grabbing reference that really stands out against dark backgrounds. Drop-in replacement for factory sight. Mfg: Marble Arms SPECS: Steel, blue, matte finish. .150" (3.8mm) blade width. Height/fits - .332" fits Super Redhawk .44 Magnum and GP-100 .357 Magnum. Will not fit 3" barrels. .390" fits Redhawk .44 Magnum, Super Redhawk .480 and Blackhawk Hunter.