Widely used in metal, mould, and mechanical drive applications.
Between the transmission member can do both screws can do model remote control boat propeller shaft and the motor power.
Connecting two axes with different diameters can also be connected with a motor axis, or connecting shafts of different diameters.
Widely used in hardware, moulds, and the occasion of mechanical transmission.

Specification:
Material: brass.
Colour: gold.
Appearance size: 9x20mm (diameter x length)
Size: 2mm to 2mm, 2mm to 3mm, 2mm to 4mm, 2mm to 5mm, 2.3mm to 2.3mm, 2.3mm to 3.17mm, 2.3mm to 4mm, 2.3mm to 5mm, 3mm to 3mm, 3mm to 4mm,3mm to 5mm,3mm to 6mm,3.17mm to 3mm,3.17mm to 3.17mm,3.17mm to 4mm,3.17mm to 5mm,4mm to 4mm,4mm to 5mm,4mm to 6mm,5mm to 5mm.

Appearance size: 10x20mm (diameter x length)
Size: 2mm to 6mm,2.3mm to 6mm,3.17mm to 6mm,5mm to 6mm,6mm to 6mm.

Appearance size: 12x20mm (diameter x length)
Size: 3.17mm to 6.35mm.

Package includes:
1 x golden brass shaft coupling.
1 x4 pcs screw