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. Many of GG&G's customers have asked them to manufacturer a non-marring"" 30mm to 1 inch scope ring reducer to fit 5/8 inch wide sniper grade 30mm scope rings or 30mm integral ring bases"" like the ones offered by GG&G. To meet their customers' requests"" GG&G decided to offer 1 inch reducers manufactured from solid Delrin. Nothing fancy"" just a rugged"" non-marring"" quality machined 1 inch ring insert that not only fits tight to your 1 inch scope"" but is priced competitively.