Even though the trend has been towards rifle scopes with 30mm tubes, there are still many high quality rifle scopes with one inch tubes in the marketplace. Nothing fancy, just a rugged, non-marring, quality machined 1 inch ring insert made of Delrin that not only fits tight to your 1 inch scope, but is priced competitively. As can be seen in the photos, the one inch insert has a recoil flange on one side that keeps the reducer in the correct position during installation and recoil. Each package includes 4 components; enough parts to to do two scope rings.