This 6 color ring set includes six (6) press-in optically flat 14mm glass filters in yellow, green, orange, brown, light grey, and dark grey. It also includes the set of push-fit rings as listed in the 507 set. Enables use of your favorite color ring with any of the filters on most standard 1 inch rear sight discs. The rings can be used with or without the filters. Will not fit Centra Iris.
Sinclair, Issue:3B, Page:214