2pcs 4-7mm 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 specification4mm to 7mm means one end is 4mm pore diameter,the other is 7mm. ?

Specification	Diameter*Length	Color
4mm to 7mm	14*25mm	Dark blue

? Package included: 2 x Coupler ? More Details: