Cylindrical rigid coupling with 4 fastening holes on the surface, 4 M4 machine screws and 1 matching hex wrench.
Metal coupling, copper sleeve, black in the picture is a total of 4 screws.
For example: 7MM-8MM means that the end is the aperture is 7MM, and the other end is 8MM.
Parameter: Inner hole = size you choose Aperture tolerance +0.05 +0.03
Length: 22mm
outside diameter:16mm
Dimensions: as shown below
Screw: M4,(different models, different top wires)
Material: Brass
List: 1 coupling, 4 screws, 1 wrench