3/3.17/4/5/6/7/8/10/11/12/14mmmm Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector Shaft Axis Bearing Fittings high quality 10pcs d19l25 cnc motor jaw shaft coupler flexible coupling od 19x25mm wholesale 4 5 6 6 35 8 9 5 10 12mm