– Double ended drill bits are derivative of HSS-G and both ends are drills – Cutting edge: 135° split point geometry which ensures no walking and slipping. – The total and working lengths are shorter than other HSS drill bits. – Application: While drilling many holes on thin metal sheets, double ended drill bits are preferred because of their short length and long life Bit Dia (D) (mm) / 5.5 Overall Length (L1) (mm) / 66 Working Length (L2) (mm) / 19.0 Per Pkg / 10