NC 드릴 CODE NO Dia x Point Angle Length of Flute Overall Length Shank Dia ΦD x 90 ° L1 L Φd NCTSN 060 6 x 90 ° 13 60 6 NCTSN 080 8 x 90 ° 23 70 8 NCTSN 100 10 x 90 ° 24 80 10 NCTSN 120 12 x 90 ° 34 90 12 NCTSN 160 16 x 90 ° 40 105 16 NCTSN 200 20 x 90 ° 40 105 20