[4mm-12mm 9-stage straight shape round shaft]

[4mm-32mm 15 steps straight shape round shaft]

[5mm-35mm 13 steps straight shape round shaft]

QLOOP HSS-CO Black Titanium Step Drill, Titanium Nitride Aluminum Coating, Cobalt High

Material: Cobalt High Speed Steel HSS-CO (TiAIN Titanium Nitride Aluminum Coating)
Titanium Nitride Aluminum Coating: With exceptional abrasion resistance and heat resistance, there is no need for cooling water.
It is excellent even without cutting oil, but we recommend using cutting oil for long lasting use.

Size: Drilling size: 0.2 - 1.3 inches (4 - 32 mm) (15 levels) (4 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 22 / 24 / 26 / 28 / 30 / 32)
Shape: Straight shape round shaft diameter 0.4 inch (10 mm)
Total length: 3.9 inches (100 mm)
Blade Length: 2.1 inches (54 mm)
Diameter pitch width: 0.9 inches (23 mm)
Effective Cutting Ability:
Iron plate: 0.1 inch (3.0 mm)
Stainless Steel Plate: 0.08 in (2.0 mm)

Reference RPM):
Soft Iron 2400-320
Stainless Steel 1200-160
Copper Glue 4800-640
Plastic 1200-160


Specifications: Because it is sharp, please use it vertically.
Regular ironwork drills temporarily heat resistant with titanium coating, but the blade will not wear out and cut before the blade is hot and the result is a higher coefficient of wear and burn.
Stainless steel is harder and more sticky than ordinary iron, so when used for work, we recommend Cobalt High Speed (HSS-CO) that is harder and more resistant to abrasion.