The Alpha C9STSIM4-20TM is a 4–20mm spiral flute step drill with 9 precision steps, engineered for fast, clean drilling through sheet metal, plastics, and non-ferrous materials. It features a 1/4" quick-change shank, making it compatible with both cordless drills and impact drivers for efficient tool changes on the job.

Built for performance, the bit includes a self-starting split point that removes the need for pilot holes, and a tempered black finish for better chip flow, heat resistance, and corrosion protection. The 2-flute spiral design supports smoother cutting and cleaner results, while laser-etched step markings ensure high visibility during use. Rated for materials up to 3mm thick (or 1.5mm in stainless steel), this drill bit is a tough, trade-ready solution for accuracy and speed.

Alpha C9STSIM4-20TM Features

• Drills 4–20mm in 9 Steps: Sizes include 4, 6, 8, 10, 12, 14, 16, 18 & 20mm.
• Spiral Flute with 2-Flute Design: Promotes smooth cutting and effective chip removal.
• Tempered Black Finish: Aids in lubricant retention and heat control.
• 1/4" Quick-Change Shank: Suits cordless drills and impact drivers for fast tool swaps.
• Self-Starting Split Point: Removes the need for pilot holes in most materials.

C9STSIM4-20TM FAQ

Q: What is this drill best suited for?
A: It’s ideal for metal, plastic, and stainless steel up to 1.5mm thick.

Q: Can I use it with an impact driver?
A: Yes, it’s compatible with cordless drills and impact drivers.

Q: Are the step sizes easy to read?
A: Yes, they’re laser-etched for clear, long-lasting visibility.