Made in Japan
Manufacturer: Tohnichi

The HH hex head is to be used for hex socket bolts (cap screws). To be used with hex key inserted.

* Note 1: To be used with hex key inserted.
* Note 2: The HH8D is for hex 6.35 interchangeable bits, not for hex socket screw keys.
* Note 3: Models with a width across flats of 5 and 6 are hex; all other models are double hex.