Irwin Unibit Titanium Metric Self‑Starting Step Drill, 4mm to 22mm | 16104
Product Description:
Professional metric step drill bit engineered for efficient hole drilling and enlargement across a range of diameters without changing bits. This Irwin Unibit features a single-flute design with a self-starting SpeedPoint® tip that helps prevent walking and improves centring on thin materials, a common requirement when working with sheet metal, aluminum panels, plastics, and laminates in automotive and collision environments. The titanium nitride (TiN) coating enhances heat resistance and cutting-edge durability in frequent drilling applications.
Covering hole sizes from approximately 4 mm up to 22 mm in consistent 2 mm increments, this step drill bit simplifies workflows where multiple hole sizes are needed, such as installing grommets, routing wiring, mounting hardware, or enlarging existing access holes during panel repair and assembly. The 3-flat shank helps prevent slipping in standard drill chucks.
Key Features:
- Self-starting SpeedPoint® tip for reliable starts and reduced walking on sheet surfaces.
- Titanium nitride (TiN) coating increases heat resistance and extends tool life in thin metals.
- Step drill design covers hole sizes from ~4 mm to ~22 mm in 2 mm increments (10 sizes).
- Single-flute cutting edge supports clean, round holes with controlled feed.
- 3-flatted 3/8″ shank reduces slipping in drill chucks for stability.
- High-speed steel construction suited to thin sheet metal and non-ferrous materials.
Ideal For:
- Body and collision shops: drilling and enlarging holes in automotive sheet metal, brackets and access panels.
- Mechanical and fabrication work: versatile hole making in aluminum, steel, plastics, and laminates.
- Electrical and trim installation: clean hole sizes without frequent bit changes.