6Pack Treehobby Aluminium Alloy Shaft Coupling Rigid Stepper Motor Wheel Coupler Joint Connector for DIY Car Boat Airplane 3D Printers, 5mm to 5mm

These are very well made with precise machining. I have used them to extend the volume control shaft on antique radios. Having two set screws locks them on very well.

Good product fast shipping

Product shipped fast and arrived on time. Parts arrived in factory packaging with good finish on products. Dimensions are to spec as stated with no visible defects. Unfortunately mine arrived without any set screws. Had some extra M4 screws but was annoying getting the little wrench to install them without getting the screws. Couplings are otherwise performing perfectly so far.

I like the quantity and the quality for the price.

didn't quit work for the project I worked on but still did use them for something else

We needed to connect two 5 mm rods in one of our inventions and these worked exactly as we needed them to.

With a full machine shop in my basement, for this price and quality, I would be a fool to make my own. These are very good couplings, and I put them on 1/2 my commercial printers already.

Does exactly what I needed. Good value.