ITEM NAME:Stepper Motor Flexible shaft coupling coupler 6.35x8mm. I4V8 Stepper Motor Flexible shaft coupling coupler 6.35x8mm. I4V8 A blocking light shaft coupler The flexible design allows to compensate non-aligned parallel and axial Release zero rotation oil and Corrosion Resistant Often uses to connect servo motor, stepper motor, encoder, screwing, platform of the machine, etc. Shaft: approx. 6.35 mm x 8 mm (inside diameter of both ends) Length: approx. 25mm outside diameter: approx. 20mm 100% brand new and high quality Material: Aluminum The package contains: 1 x coupling Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.