HIVIZ 3/8-Inch Dovetail Fiber Optic Rifle/Muzzleloader Sight 0.38 Height Fits: any 3/8 inch dovetail Height: .380" - 3/8" Made in the USA Front sight for dovetailed rifle/muzzleloaders .380 inch height Interchangeable style includes 3 red and 3 green LitePipes Fits rifles and muzzleloaders with 3/8 inch dovetail Height of sight is measured from base of dovetail to top of sight HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.