Makita 8mm Threaded Rod Socket Adaptor (1/4" Hex Drive) B-42977
Features:
By rotating the threaded rod inserted into the socket bit, the pins inside of the socket move towards the center of the socket along to the inner surface of the socket and grip the threaded rod tightly.
With that state, you are able to screw the threaded rod by rotating the socket bit.
Specifications:
Size 8 mm (M8)
Length 66 mm