Classic steel, holds scope tightly. Fits Leupold STD, one- and two-piece bases, plus bases from Burris, Millett and Redfield.
Big Book Catalog, Issue:70, Page:259
Sinclair, Issue:5B, Page:203
SPECS: Steel 1" (2.5cm), 26mm (1.02") or 30mm (1.18") I.D.
Gloss, polished blue. Matte, matte blue.
Silver, satin nickel. Height measurements are from top of
base to center of ring: 1", 26mm and
30mm: Super Low, .550" (13.9mm). Low, .650" (16.5mm).
Medium, .770" (19.55mm). High, .900" (22.86mm). Super High, 1"
(25.4mm). Extension Ring Set (Extension) contains one
standard ring, and one front extension ring that offsets ring
spacing .650" (16.5mm).