This is a great Old Remington Rolling Block Rifle Vernier Tang Sight. This sight came of of a Number 4 Rolling Block in 32 RF caliber. This Tang Sight is Original and unmarked. There is one hole in base for rifle attachement. The sight is 3 1/8" tall from base to top. Works great. Not certain if this will work on other rifles like Winchesters, Marlin Ballards, Stevens the same way.