OCFHE5MM15S
Octura Flex Hex Coupler
5mm to to .150 Cable.
This is the shorter length version. Octura also makes a longer coupler, part number oct-ocfhe5mm15d.
Specs:
Motor size 5mm
Flex Cable size .150 (3.81mm)
Length 1.00" (25mm) long
Diameter .50" (13mm) at widest point