The shaft couplings are mechanical component that connect the drive shaft and driven shaft of a motor, etc., in order to transmit power. Shaft couplings introduce mechanical flexibility, providing tolerance compatible shaft misalignment. As a result, this coupling flexibility can reduce uneven wear on the bearing, equipment vibration, and other mechanical troubles due to misalignment. This shaft coupling features simple structure and compact size, it is convenient compatible installation. The merits of buffering, shock absorption, dismountable make this shaft coupling practical to use. The size is complete and the surface is smooth, convenient compatible use. The flexible connection design can absorb vibration and compensate compatible radial, angular and axial misalignment. Made of high-quality aluminum alloy, this shaft coupling is durable and powerful. The length of this shaft coupling is 30mm, the width is 25mm. It is commonly used to connect 3D printer, actuating motors, stepping motors, encoders, machine tool, etc. Item Name: Shaft Coupling Material:Aluminum Alloy Specification: 1: 5 x 5mm 2: 5 x 8mm Size:2.5cmx2cmx2cm/0.98inx0.79inx0.79in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Plum Shaft Coupling