Double ended drill bits are derivative of HSS-G and both ends are drills like double headed bits.
Materials / Same material as HSS-G and fully ground.
Cutting edge / 135° split point geometry which ensures no walking and slipping.
The total and working lengths are shorter than other HSS drill bits.
Size / Total 21sizes from 2.0mm to 10.0mm including 3.1mm,
3.2mm, 3.3mm which are suitable sizes for drilling holes for
rivets.
Depth of hole / 30% shorter than HSS-G. Suitable for thin metal
sheets because of the length.
Package / Each size 10 pieces a pack.
Application / While drilling many holes on thin metal sheets, double ended drill bits are preferred because of their short length and long life.