Step Drill 3-Piece Kit
- World-Exclusive Coating
- Impact Wrench Powered
- PTIA 2025 Winner
All three SITEH3RO™ step drills in one case — drill any hole size from 1/8" to 1-3/8" with your impact wrench.
- In StockShips fast from Unibor HQ in Chicago
- Award WinnerPTIA 2025 Tool Innovation
- Real SupportUS-based team — call or email anytime
Engineered for Professionals. Exclusive by Design.
Designed by Unibor for tradespeople who value tools that last and outperform. Every SITEH3RO™ product is engineered around three things you won't find together anywhere else.
A Coating No Competitor Has
Every cutting tool in this kit carries the proprietary SITEH3RO™ coating — exclusive to us, not available from any other manufacturer. Independently high-temperature tested to 356°F. Delivers up to 75% longer tool life across the whole system, which means more jobs per tool and faster payback on the kit.
Runs on the Tool Already in Your Hand
The SITEH3RO™ shank system is the only metalworking cutting-tool interface engineered to harness the full power of a modern impact wrench. Connect from any angle, lock in seconds, and turn a $200 impact driver into a full-range metalworking machine. No chucks, no adaptors, no slippage. Patent pending (WO2024/100390).
Designed by Unibor. Made for Metal.
Designed by Unibor — a metalworking tool specialist based in Lombard, Illinois, and winner of the PTIA 2025 Tool Innovation Award. Every SITEH3RO™ product is engineered by people who've worked metal for decades, to the standards real tradespeople set.
- 3 step drills: 1/8"-1/2", 3/16"-7/8", 1/4"-1-3/8"
- Covers every common hole size from 1/8" to 1-3/8"
- Spiral flute, split point design — clean starts, accurate holes
- SITEH3RO™ coating on all drills — up to 75% longer tool life
- Also compatible with 3-jaw drill chucks for bench or press use
| Contents | 1/8"-1/2", 3/16"-7/8", 1/4"-1-3/8" |
| Pieces | 3 |
Key features?
Split point for accurate positioning and spiral flute for fast chip evacuation. SITEH3RO™ coating extends life by up to 75%.
Standard drill chuck?
Yes — works in 3-jaw chucks as well as SITEH3RO™ holders.
What materials?
Thin gauge metals — ideal for HVAC, automotive, electrical and fabrication work.
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