Flange coupling is a special type of coupling that can fix a shaft to a flat surface and easily install other accessories on the shaft.
This product is made of aluminium alloy material, with lightweight and blackened surface treatment.
When making robots, if you like to create old effects, you can use sandpaper to polish them appropriately to create that kind of realism.

Does not include a wrench

Use M1.5 Hex key to fix 3mm and 4mm couplings
5mm and 6mm couplings shall be fixed with M2 Hex key
Material: Aluminum alloy
Center aperture 3/4/5/6mm
Fixed hole spacing: 3mm, 4mm specifications, about 15.5mm
5mm, 6mm specifications, about 20.5mm