4pcs 6mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector - Walmart.com
Stepper Motor Flexible Coupling 6mmx8mm
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Aluminum Flex Shaft Coupler - 5mm to 8mm : ID 1176 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
CNC Coupling – Sherline Products
Amazon.com: Sydien 2Pcs 5mm to 10mm Motor Shaft Coupling Aluminum Alloy Flexible Stepper Motor Coupler Motor Connector Joint for 3D Printer, CNC Machine : Industrial & Scientific