Step Reamers

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Step Reamers

SKU: SR312562

World-Exclusive Coating
Impact Wrench Powered
PTIA 2025 Winner

Open up and smooth pre-drilled holes across a range of sizes in one pass. One tool replaces multiple reamers — essential for fitters and fabricators.

Select Size

$103.22

In StockShips fast from Unibor HQ in Chicago
Award WinnerPTIA 2025 Tool Innovation
Real SupportUS-based team — call or email anytime

Works with SITEH3RO™ HoldersGot one already? You're set. First time? Pair with a 1/2" or 3/4" holder to match your impact wrench.

1/2" Holder 3/4" Holder

The SITEH3RO™ Difference

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.

World-Exclusive

A Coating No Competitor Has

Our proprietary high-performance coating is exclusive to SITEH3RO™ — not licensed, not available from any other manufacturer on any other step reamer. Independently high-temperature tested to 356°F. Delivers up to 75% longer tool life than standard step reamers, so you can true up and finish more holes per tool before the cutting edges dull.

Patent Pending

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).

PTIA 2025 Winner

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.

SITEH3RO™ step reamers cover multiple hole diameters in a single tool — ideal for fitters and fabricators who work across a range of bolt sizes. The dual flute design opens up and smooths pre-drilled holes without chatter, and the SITEH3RO™ coating delivers up to 75% longer life than standard reamers. Runs straight from your impact wrench via a SITEH3RO™ holder.