Catalog > Internet of Things (IOT) Related Products > More Platforms ID DC Gear Motor Shaft Coupling to Wheel Coupling to Wheel Shaft CMU HEX SHAFT COUPLING 18MMX3MM 3mm ID DC Gear Motor Shaft Coupling to Wheel. Length=18mm 24.78 ZAR inc for 1 Each 23 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Material: Brass Inside Diameter: 3mm The total length: 18mm Weight: about 36 g Screw: 3x6,4x8, one of each Usage: for connecting gear motor and tire