This is modeled off of an old Pre-64 Winchester saddle ring. The ring material is 0.188" diameter and the ring itself has an outside diameter of 1.125" (1-1/8"). The stud has a threaded section that is 0.20" long with 1/4"-30 threads.
The original pre-64 Winchester saddle ring Model 94 rifle used 1/4-30 pitch threads for the saddle ring. If installing in a pre-existing hole, please verify depth and thread pitch prior to install to avoid damaging your rifle.
This piece has a brass threaded stud and a blued steel ring. The brass stud went through the bluing process with the ring as one whole part. This caused the brass to come out stained a little bit of a brown color. The outer portion of the stud has been polished back to a shiny brass color, but the inner portion near the hole where the ring passes through cannot be easily polished without damaging the bluing on the ring. This is the reason for the reduced price of this item. See photos.