Description Flexible Shaft Coupling OD19mmx25mm CNC Stepper Motor Coupler Connector 3 To 8mmSpecification Material Aluminum LY12 Outside diameter D 19mmHeight L 25mmColor silverThe size you can choose 3mm 3mm3mm 6 35mm4mm 4mm4mm 5mm4mm 6mm4mm 6 35mm4mm 8mm Character The structure is simple easy to install buffer damping convenient to disconnect The size is complete and the surface is smooth Connect servo motor stepper motor encoder screw driving machine etc Notice The size is refer to the hole for example 4X6 is known as one head of the hole diameter is 4mm the other is 6mm Package included 1XCouplerMore Details