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Length: 25mm.

Shaft: 6 x 8mm.

This is perfect for all those and Fans, This is great little gadget that allows you to connects gears, rods etc to the 5V stepper motors that are commonly used for Robotics, 3D printer and other projects.

Shaft coupler often used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc.

Easy to install,buffer,damping,convenient to disconnect.