The Power Tool Industry Association 2025 Tool Innovation Award recognizes tools that meaningfully change how tradespeople work.
SITEH3RO™ won for letting one operator do work that previously needed a drill press and bench setup, using the impact wrench they already own.
Powered by your impact wrench
Most reamers chatter or oversize the hole under impact-wrench torque. SITEH3RO™ step reamers are specifically engineered for impact-wrench drive. No drill press required. Step-finish holes to exact spec on the job.
Drives from any 1/2" or 3/4" impact wrench using a SITEH3RO™ holder, which is required and sold separately. One holder works with every SITEH3RO™ tool.
Built by people who work metal
SITEH3RO™ is the direct-to-tradesperson line from Unibor, a Lombard, Illinois metalworking-tool specialist that has supplied bridge builders, structural fabricators, and US shipyards for decades.
Designed by engineers who've spent careers in fab shops, to the standards real tradespeople set.
US-Based Support
Questions before you buy, or help after it arrives? Our support team is based in the US and knows these tools from the ground up. Email us or reach out via the site - real answers, not scripts.
// About SITEH3RO™
Designed by Unibor. Made for metal.
SITEH3RO™ is Unibor's ultimate handheld metalworking solution - designed for on-site metalworking with just an impact wrench. Made for metalworkers, #BUILTForMetal
Multi-size step reamer that finishes a range of hole sizes from a single tool. Step geometry produces clean, on-spec holes without chatter even under impact-wrench drive. Ideal for bridge work, structural connections, and heavy-equipment fab.
SKUSR312562
Size5/16" to 9/16"
Drive1/2" square
TypeMulti-step spiral flute reamer
Steps per tool5
Available sizes15 sizes, 5/16" to 1-1/16"
CoatingProprietary, 75% longer tool life
Heat tested to356°F
RequiresSITEH3RO™ holder, sold separately
Free US shipping on all orders. Ships from Chicago. Orders are processed in 1 to 2 business days, and delivery takes 3 to 7 business days.
