Flex capability of the coupler removes stress when shafts are not aligned perfectly. Suitable for connecting two axis with different diameters, can also be connected with a motor axis, or connecting shafts of different diameters. Features - Color: Blue. - Size: 2.70X1.50X1.50cm/1.06X0.59X0.59 inch. - Material: Aluminum alloy. - Widely used to connect servo motor stepper motor,encoder screw driving machine platform etc. - Easy to install and disconnect, providing buffering and damping. - Replace old or broken encoder with a new one. Perfect accessory for 3D printer. - The elastic connection, you can absorb vibration, compensate radial, angular and axial misalignment. - It is manufactured with professional technology to ensure the of the product and can work for a long time.