What's in the box:

Aibecy Aluminium Alloy Shaft Coupling 5mm to 8mm Bore 14mm Outside Diameter Rigid Couplers Connector for 3D Printer Stepper Motor CNC (Standard)

Features:
5mm to 8mm bore, total length 25mm, outside diameter 14mm.
Made of aluminum alloy material. Able to withstand large torque transmission.
Rigid coupling, light weight, low inertia and excellent sensitivity.
High hardness, strong wear resistance, good corrosion resistance.
Suitable for motor, hardware, mold, CNC, and other mechanical transmission occasions.

Specifications:
Material: Aluminum Alloy
Quantity: 2pcs
Outside Diameter: 14mm
Height: 25mm
Aperture: 5*8mm
Thread Size: M4*4mm
Item Size(1pc): 1.4 * 1.4 * 2.5cm / 0.6 * 0.6 * 1.0in
Item Weight(1pc): 7g / 0.2oz
Package Size: 13.1 * 9.0 * 1.5cm / 5.2 * 3.5 * 0.6in
Package Weight: 18g / 0.6oz

Packing List:
2 * Rigid Shaft Couplers