Found on everything from scope rings and bases, to autos and appliances. T-10 bit fits Brownells Scope Ring Screws.
1911, Issue:01, Page:045
1911, Issue:01, Page:047
1911, Issue:02, Page:045
1911, Issue:02, Page:047
1911, Issue:03, Page:050
1911, Issue:03, Page:051
1911, Issue:04, Page:050
1911, Issue:04, Page:051
1911, Issue:05, Page:049
1911, Issue:05, Page:051
1911, Issue:06, Page:050
1911, Issue:06, Page:052
1911, Issue:07, Page:050
1911, Issue:07, Page:052
1911, Issue:08, Page:050
1911, Issue:08, Page:052
1911, Issue:09, Page:056
1911, Issue:09, Page:058
1911, Issue:10, Page:058
1911, Issue:10, Page:059
1911, Issue:11, Page:053
1911, Issue:11, Page:055
Big Book Catalog, Issue:49, Page:049
Big Book Catalog, Issue:49, Page:131
Big Book Catalog, Issue:50, Page:049
Big Book Catalog, Issue:50, Page:136
Big Book Catalog, Issue:51, Page:053
Big Book Catalog, Issue:51, Page:133
Big Book Catalog, Issue:51, Page:147
Big Book Catalog, Issue:52, Page:049