Features:The Oldham coupling is made of brass, reduce friction and has sufficient strength;Fit for DIY enthusiasts and professionals in the field of 3D printing.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.High-precision CNC machining screw thread, tighter fit and more stable. It is recommended- to buy high-quality screw rods, which will achieve the best result.Thread:Compatible with T8x8 Screw; Specifications:Material:Brassfor Ender3/CR10 3D PrinterThread:Compatible with T8x8 Screw; Note:Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1xOldham Coupling