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Common boring tool used with a bit brace. The cutting end has a tapered lead screw, two cutters, and two scoring nickers. The shank is surrounded by a spiral that carries away shavings. The traditional shank end, for use with a bit brace, is a tapered square lug.
GalleriesScrews, Drills and Drill Bits
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
1812×2400, 348.5 KiB
773×1024, 53.4 KiB
483×640, 27.4 KiB
241×320, 10.3 KiB