Tin-Coated HSS Step Drill Bits with flat surface
1. Material: HSS M2
2. Thermal treatment: Bit part 62-65HRC
Bit shank 40-50HRC
3. Surface treatment: TIN coated
4. Shank: Hex shank, (CNC milling machine control, handle uniformity division. ) or 3 flat shank
5. Flute type: Straight flute or spiral
6.package ; metal box,plastic box,wooden box,blister card
7.specification:
| Size | Step Qty | Shank Dia |
| 4 - 12mm x2mm | 5 | 6mm |
| 4 - 12 mmx1mm | 9 | 6mm |
| 4 - 20mm x2mm | 9 | 8mm |
| 4 - 22mm x2mm | 10 | 8/10mm |
| 4 - 30mm x2mm | 14 | 10mm |
| 4 - 32mm x2mm | 15 | 10mm |
| 4 - 39mm x2-3mm | 14 | 10mm |
| 5 - 28mm | 7 | 10mm |
| 5 - 28.3mm | 10 | 10mm |
| 5 - 35mm x2-3mm | 13 | 13mm |
| 6 - 18mm x2mm | 7 | 10mm |
| 6 - 20mm x2mm | 8 | 10mm |
| 6 - 24mm x2mm | 10 | 10mm |
| 6 - 25mm | 7 | 10mm |
| 6 - 26.75mm | 8 | 10mm |
| 6 - 30mm x2mm | 13 | 10mm |
| 6 - 30.5mm | 10 | 10mm |
| 6 - 32mm | 8 | 10mm |
| 6 - 32mm | 9 | 10mm |
| 6 - 37mm | 12 | 10mm |
| 6 - 38mm | 12 | 10mm |
| 6 - 40mm | 16 | 13mm |
| 9 - 36mm x3mm | 10 | 12mm |
| 10 - 20mm x1mm | 11 | 10mm |
| 12 - 20mm x1mm | 9 | 10mm |
| 12.5 - 30.5mm | 7 | 12mm |
| 13 - 38mm | 10 | 12mm |
| 14 - 24mm x2mm | 6 | 13mm |
| 14 - 25mm | 7 | 13mm |
| 20 - 30mm x1mm | 11 | 13mm |
| 20 - 34mm x2mm | 8 | 13mm |
| 30 - 40mm x1mm | 11 | 13mm |
| 40 - 50mm x1mm | 11 | 13mm |
| 50 - 60mm x1mm | 11 | 13mm |
| 5 - 30.5mm | 13 | 12mm |
| 5 - 38mm | 14 | 12mm |