3/8 Inch Drive Long Hex Bit Socket 3-12mm

Metric hex fasteners recessed deep inside assemblies demand a socket with the reach and engagement to handle the job without slipping. This Teng Tools long-profile hex bit socket measures 74 mm (2.9 in) in overall length, providing the extra clearance required to access Allen-head bolts set inside engine covers, transmission housings, and industrial frames.

The 12 mm tip engages all six flats of the fastener simultaneously, spreading the turning force across the maximum possible contact area. That full engagement helps prevent a partially seated bit from stripping a head, especially as torque values rise during stubborn removals.

The 3/8 inch square drive end connects directly to any standard ratchet, breaker bar, or torque wrench in your existing toolkit. No adapters or reducers are needed, which means zero additional play in the drive train — every foot-pound goes straight from the handle to the fastener.

Sold individually so you can pick up exactly the size you need. Whether you are replacing a lost socket, upgrading from a worn-out budget bit, or building a custom tray of only the metric sizes your shop encounters daily, buying one at a time keeps your investment focused and your drawer organized.

From heavy-duty diesel engine work to precision manufacturing equipment maintenance, the combination of long reach and accurate metric sizing makes this socket a reliable everyday tool for professionals who cannot afford stripped bolts or wasted shop time.