Made for a snug fit on hex-shaped fastener heads, the 6-point opening applies maximum torque without slipping. To prevent round off, it grips the stronger flat sides of heads rather than the weaker corners.
With an extra-deep broach, this socket reaches over long, threaded shafts to access nuts.
Detent notches inside the drive end securely locks socket onto ratchets and extensions, so it won't fall off or stick on fastener heads.