RUKO STB-HSS-TiAlN Step Drill Bit 3-12 mm, 10 Steps, Hex Shank 1/4 inch

For electricians and sheet-metal workers who need clean, burr-free holes in thin materials, this RUKO step drill bit combines drilling and deburring in one pass. The TiAlN coating reduces friction and heat, so the bit stays sharp longer when working in steel, non-ferrous metals, plastics, and thin sheets.

Key specifications

• Drilling diameter range: 3–12 mm
• Number of steps: 10 (1 mm increments)
• Material: High-speed steel (HSS)
• Coating: Titanium aluminum nitride (TiAlN)
• Shank: 1/4" hex (6.35 mm)
• Overall length: 66 mm
• Max material thickness: 4 mm
• Point angle: 118°
• Flute type: Spiral flute, right-hand cut
• Self-centering point: Yes
• Deburring capability: Yes
• Standard: DIN 1412 C

Why choose it

The TiAlN coating provides high hardness and heat resistance, extending tool life compared to uncoated HSS bits. The self-centering point eliminates the need for a pilot hole, and the hex shank prevents slipping in the drill chuck.

Ideal use cases

• Enlarging existing holes in sheet metal
• Drilling cable entry holes in control panels
• Creating clean holes in plastic enclosures
• Deburring punched or laser-cut holes

Good to know

Use a cutting fluid or coolant for best results and longer tool life. The step design allows multiple hole sizes with one bit, reducing tool changes on the job.