Lets You Use Weaver-Style Rings On Any 3/8" Dovetailed Receiver
Weaver-style conversion bases let you mount optics on any .22 caliber rifle with a 3⁄8" dovetailed receiver. One-piece model has eight slots that allow you to vary the ring spacing and mount a variety of different eye-relief scopes. Two-piece model, with a single slot on each base, ensures the correct ring spacing, while preserving easy access to the chamber. Made of aluminum to keep additional weight to a minimum with steel cross-bolt and clamping bar for a tight hold.
Big Book Catalog, Issue:66, Page:250
SPECS: Aluminum with steel hardware, matte black finish. 1-Piece - 4.3" (10.9cm) long per pair. 2-Piece - .8" (2.1cm) long, each.