Car Reamer

SKU: CR312

World-Exclusive Coating
Impact Wrench Powered
PTIA 2025 Winner

Expand and align holes in steel with your impact wrench — no drill press, no lugging heavy tools. Built for ironworkers, fabricators, and auto body.

Select Size

$80.10

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 reamer. Independently high-temperature tested to 356°F. Delivers up to 75% longer tool life than standard car reamers, so your flutes stay sharp through more hole expansions before they start to grab.

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™ car reamers expand, align, and deburr pre-drilled holes in structural steel, plate, and auto body. Engineered to drop straight into your SITEH3RO™ holder and run from a 1/2" or 3/4" impact wrench — no drill press, no jobsite setup. The spiral flute design pulls chips up and out for a clean, accurate hole in seconds, and the high-performance SITEH3RO™ coating delivers up to 75% longer tool life than standard HSS reamers.

High-performance SITEH3RO™ coating — up to 75% longer tool life
Spiral flute design for faster, cleaner cuts with less vibration
7/16" hex shank — drops into any SITEH3RO™ holder
Also compatible with standard 3-jaw drill chucks for bench or press use
M2 HSS construction built for structural steel and auto body work

Available Sizes	5/16" to 1-1/16" — 13 sizes in total
Shank	7/16" Hex
Material	M2 HSS
Coating	SITEH3RO™ proprietary (not available elsewhere)
Compatibility	SITEH3RO™ holders, standard 3-jaw chucks

Safe in an Impact Wrench?

If the reamer grabs, the impact absorbs the torque — no wrist injury risk.

Spiral flute advantage?

Faster, more efficient cutting with minimal vibration.

SITEH3RO™ coating?

Dissipates heat, extends life by up to 75%.

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