This Creedmore style sight fits a variety of rifles with minor modification. The base of the sight is 2" long and the mounting holes are drilled 1-17/32" apart (center to center). The overall height is 5.06 inches with 2.88 inches of elevation adjustment. The outside diameter of the peep disk is a full 1 inch and the hole is .015 inches in diameter. The sight pivots down for easy storage in a case or safe.