This Oldham coupling is made of brass for reduced friction and sufficient strength. CNC machining controls the clearance in the joint position.Using this coupling for the Z- spindle of a 3D printer reduce print quality problems caused by hot bed oscillation during the printing process. Threaded holes in both top and bottom sections. Easy installation without nuts. Easy to install and dismantle. Compact dimensions Low rotationalinertia. Accommodates large radial misalignments Has high torsional rigidity. Good finish and Longer service life. Quantity:2PCS Color:Gold Material:Brass Package Contents: 2 * Z- Coupler Only the above package content, other products are not included. Note: Light reflection 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 +/- 1-3cm.