![Talley Peep Sight - store.TalleyScopeRings.com](http://store.talleyscoperings.com/cdn/shop/products/peep_sight_1_1024x1024.jpg?v=1456300512)
Must be fitted to a rear steel base or otherwise fitted to a 1/2 inch dovetail ... height of aperture above base .300 inch, approximate diameter of aperture 0.140 inch, windage adjustable only.
If you order a rear steel base then write in the "notes" part of your order the make and model of your rifle, as per example Winchester model 70 chambered in 375 H&H