Features：

• HSS Steel Construction - High-speed steel construction for longer cutting edge life even at extreme temperatures.
• Titanium Coating - Coated by titanium, this step drill set performs well in heat, corrosion and rust resistance.
• Automatic Center Punch - Delivers an automatic, high-impact, spring-loaded strike when pressed against a surface, adjustable cap regulates striking force.
• Multiple sizes - The bits set includes three standard step drill bits that have Wide application for 4-12mm， 4-20mm， and 4-32mm.
• Meet Your Demands - With the step drill bits we offered, you can process different kinds of diameter holes, which greatly saves you a lot of trouble. Great for metal/wood/plastic countersunk. Suitable for Home DIY, and General Building/Engineering Use.

Specifications:

• Material: HSS Steel
• Coating: Titanium
• Step Drill Bit Sizes:
  • 4-12mm（4，5，6，7，8，9，10，11，12mm)
  • 4-20mm（4，6，8，10，12，14，16，18，20mm)
  • 4-32mm（4，6，8，10，12，14，16，18，20，22，24，26，28，30，32mm）