52-piece Kit has the two, old-style Gib Locks and Gib Screws, plus the new-style Elevation Screw required to lock adjustments.
Big Book Catalog, Issue:65, Page:278
SPECS: Kit contains: 12, Elevation Gib Locks; 12, Windage Gib Locks; 12 Elevation Gib Screws; 12 Windage Girb Screws. 12, New Style Elevation Screws. Supplied in plastic bench box. Re-fill Paks contain 12 Gib Locks or Screws.