Found on everything from scope rings and bases, to autos and appliances. T-10 bit fits Brownells Scope Ring Screws.
1911, Issue:09, Page:056
1911, Issue:09, Page:058
Big Book Catalog, Issue:65, Page:133
Big Book Catalog, Issue:65, Page:134
Big Book Catalog, Issue:65, Page:389
Big Book Catalog, Issue:65, Page:447
Big Book Catalog, Issue:65, Page:450
Big Book Catalog, Issue:65, Page:477
Big Book Catalog, Issue:65, Page:491
Law Enforcement / Police Store, Issue:08, Page:057
New Product Supplement, Issue:566, Page:059
SPECS: 1" (2.5cm) long. ¼" (6.3mm) shank. Set includes ten bits.