RUKO STB-HSS-TiN Step Drill Bit 4-12mm, 9 Steps, TiN Coated

Drills, reams, and deburrs in one operation across a 4.0–12.0 mm range with 1.0 mm increments. The titanium nitride coating on high-speed steel reduces friction and extends tool life.

Overview

The RUKO STB-HSS-TiN step drill bit is engineered for clean, accurate holes in sheet metal and other thin materials up to 4.0 mm thick. Its self-centering point and right-hand spiral flute ensure smooth cutting, while the 118° point angle provides efficient material removal. The straight shank with 6.0 mm diameter fits standard drill chucks.

What stands out

• Nine steps from 4.0 mm to 12.0 mm in 1.0 mm increments
• TiN coating for wear resistance and reduced friction
• Self-centering point eliminates pilot drilling
• Deburring capability for finished edges in one pass
• Suitable for sheet metal, non-ferrous metals, plastics, and thin wood

Technical details

• Material: High-Speed Steel (HSS)
• Coating: Titanium Nitride (TiN)
• Shank type: Straight shank, 6.0 mm diameter
• Overall length: 67 mm
• Max material thickness: 4.0 mm
• Point angle: 118°
• Flute type: Spiral flute
• Cutting direction: Right-hand cutting
• Recommended materials: Sheet metal, non-ferrous metals, plastics, thin wood, stainless steel (up to 4 mm thickness)
• Max tensile strength of material: Up to 900 N/mm²
• Standard: DIN 1412 C

Our verdict

A versatile step drill for professionals and serious DIYers who need precise, burr-free holes in thin materials without changing bits.