1/16" to 1/2" in 1/64" increments 135 degree split point, Fully ground, Self-centering, Stubby length Black/gold colored finish Neatly organized in a Metal Case, Drill Indexed Left-hand bits can used to drill a broken screw or bolt so it can be extracted without needing a specialized extractor. * Tri-flat shank. 1/16" to 1/2" *135 Degree Split Point *Fully Ground *Self-Centering *Jobber Length. Left-hand bits can used to drill a broken screw or bolt so it can be extracted without needing a specialized extractor.