The revolutionary Signature design produces consistent accuracy, tremendous gripping power and stress-free mounting. These steel rings include a pivoting synthetic insert that increases the scope-to-ring mounting surface while protecting the scope finish. Additional Pos-Align Offset Inserts can be purchased (sold separately) to correct any misalignment of receiver holes or rings or even to provide additional windage and elevation adjustment.Features1" rings come with two sets of "0" (zero) inserts30 mm rings come with two sets of "0" (zero) inserts and two sets of +10 and -10 (equal to +/- .010"). These are the only insert sizes available.34 mm rings come with two sets of "0" (zero) inserts, one set of +10 and -10, and one set of +20 and -20.Notes Signature rings have synthetic pivoting inserts which increase scope to ring surface area, create consistent accuracy, give more gripping power and enable scratch free and st...