HSS Multi step drills
No.
Drill size
(mm)
Overall Length
(mm)
steps
Shank Dia.
(mm)
1
4,5,6,7,8,9,10,
65
9
6
11,12
2
4.6,8,10,12,14,16,
75
9
8
18,20
3
4,6,8,10,12,14,16,
100
14
10
18,20,22,24,26,28,30
4
10,11,12,13,14,15,
85
11
10
16,17,18,19,20
...
Products: rock drilling bits,
core drilling machine