This is the 57W front sight. It is .570 inches high (measured from the top of sight to bottom of dovetail) with a 1/16 inch IVORY bead. It?s width of .531 inches (measured at base of the dovetail) make it too wide for sight ramp but a great fit if you have a 3/8 in dovetail milled directly into your barrel. With a simple brass or nylon punch, this sight will drift into that dovetail. Winchesterdage adjustment is preformed using the same technique. This Front Sight is manufactured by Marble Arms Co. here in the US. They are the same company that was making Sights for Winchester, Marlin, Savage, Stevens, Remington, Colt, rifles in 1900. It machined from solid steel to exact standards and then blued.