Drill bits in the set:

Application:

The drill bits are made from Titanium nitride coated HSS (hi-speed steel). The drill bits are fully precision ground at 135°
with a split point. The drill bits can also be used to drill either wood
or metal.

Sharpening:

The drill bits are re-sharpenable several times. We recommend the following
machines as it will sharpen 135° HSS  split point drill bits with ease:

• Drill Doctor®
  500X – Diameter range of 2.4mm – 13mm (19mm accessory available)
• Drill Doctor®
  750X – Diameter range of 2.4mm – 19mm
• DAREX®
  V390 – Diameter range of 3-19mm

TIP:
When drilling hard metals, always use a coolant/lubricant. We recommend using CT-90.