These are for a Winchester 70 Magnum action with the .330 rear scope base hole spacing. Will work on Safari Express model or any other model with those dimensions. When the Talley Scope rings are in place, the peep sight is pushed down flush with the base. When the scope is removed, the sight pops up under spring tension. These sold for $150.00 new. These are in excellent condition. $130.00 shipped USPS.