This Oldham coupling is made of brass, which reduces friction and has sufficient strength. CNC machining controls the clearance at the connection location. The use of this shaft coupling for the Z-axis screw of the 3D printer will reduce the printing quality problems caused by the swing of the hot bed during the printing process. It is small in size and easy to install and disassemble. Compact size, low moment of inertia Adapt to large radial misalignment. It protects driven parts and support bearings It has high torsional stiffness. Good and longer service life Item Type:Bracket(Support) Model Number:10VzBoTOHC Use For:VzBoT/BLV 3D Printer color:Gold Material:brass Package Contents: 1 x Oldham Coupling Only the above package content, other products are not included. Note: Light 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.