1. The unique step structure, a variety of standard size drill carve aperture, a box arrived on a ladder drill bit.
2. Without the use of center punch, easy to break, a step drill specifications apply.
3. Deburring, chamfering, expanding the oval hole
4. Small sway, without leading to use a center punch can carve out a nice aperture.
5. Surface treatment: Titanium
5 step drill bit: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm)
9 step drill bit: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)
10 step drill bit: 3-12mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm)
1 x 3 PC HSS step drill
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