Description:Quality MaterialThe Z-axis Oldham coupling coupler of the 3D printer is made of brass with high precision. It has high torsional stiffness, protects driven parts and supports bearings.Printing Quality ImprovementIf your screw rod is not straight, the printing may have a layer misalignment problem. Our Oldham coupling coupler can reduce the vibration and thus improve printing accuracy.Easy to UseThe Oldham coupling coupler is convenient to use. It has a low moment of inertia and is easy to install and disassemble. You can do the work just with simple hand tools.Wide CompatibilityThis Oldham coupling coupler is compatible for the 8mm screw rod, the fixing hole is M3 and two holes distance is 18mm. It fits for Ender 3, fits for Ender 3 Pro, fits for Ender 3 V2, etc.Compact SizeThis Oldham coupling coupler is compact. About its length, width, height, big hole diameter and small hole diameter, they measure about 2.38 x 1.5 x 1.36 x 1.02 x 0.23cm/0.94 x 0.59 x 0.54 x 0.4 x 0.09 inches.Specification:Material: brassColor: goldFeature: durableSize(approx.): (L x W x H x big hole diameter x small hole diameter) 2.38 x 1.5 x 1.36 x 1.02 x 0.23cm/0.94 x 0.59 x 0.54 x 0.4 x 0.09inchPackage Included:1 PC x Oldham Coupling CouplerNote:1. Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2. Please allow 1-2 cm differences due to manual measurement.