Type: Flexible shaft couplingMaterial: AluminumSize: 3.5 x 3cmouter diameter: 3mmlength: 35mmthe structure is simple, clean to install, buffer, damping, appropriate for disconnecting.It involves the dimensions and the outside is smooth.the elastic connection, can soak up vibration, atone for axial, angular and radial misalignment.shaft coupling is usually used to attach the servo motor stepper motor, encoder, screwed, platform etc. of the machine.Note: Size refers to the hole, for example, can be a 10x14mm head bore diameter is 10mm, the other is 14mm.Package Contents: 1 x Spider Flexible couplingOnly the above kit contents are included, no different merchandise are included.Note: Light mirrored image and varied displays can cause the object coloration in the photograph to be slightly diversified from the real color. Measurement tolerance is +/- 1-3cm.