Package includes: 10 PCS Flexible Couplings 5mm to 8mm NEMA 17 with 1 Allen Wrench. Size: Length = 25mm, Outer diameter = 19mm, Inner hole = 5mm. Quality material: Made of premium aluminum alloy material, it is durable with a long lasting use. Advantages: Flexible couplings can eliminate the stress between the motor and drive parts to reduce the imbalance and misalignment that occurs, and provides an extremely tight grip without marring the shaft. Wide Application: Compatible with NEMA 17 stepper motors. Ideal for connecting different shaft diameters for RepRap 3D Printers or small CNC machines, as well as servo motor, stepper motor, encoder, screw driving, machine platform, etc.
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