sheeters drill - front and side view
Extra Length Sheeters Drills are used in the erection and assembly of corrugated metal buildings and other sheet metal applications. The 135° long sweep split point ensures easy centering and less breakage in hand held drilling operations. They are sometimes referred to as Corrugated Construction Drills or Body Drills.
Extra Length Sheeters Drills page 17

Wire Gauge Sizes (Straight Shank) #1 Diameter.
SIZE DEC. EQUIV. FLUTE LENGTH OVERALL LENGTH
#1 .228 1-1/4 2-1/4
#1 .228 1-1/4 3
#1 .228 1-1/4 4-1/2
#1 .228 1-1/4 6
#1 .228 1-1/4 7-1/4
#1 .228 1-1/4 12