5pcs 5-8mm Shaft Coupling Rigid Coupling Coupler Motor Connector With Spanner

Specification: Material: Aluminum Alloy Diameter*Length: 14*25mm,color is Dark Blue Screw Hole diameter: 4mm Transfer Pore diameter: multiple specification Pore diameter tolerance: +0.02mm For example:the specification5mm to 6mm means one end is 5mm pore diameter,the other is 6mm ?

Specification	Diameter*Length	Color
5mm to 8mm	14*25mm	Dark blue

? Package included: 5 x Coupler ? More Details: