Product is good quality. Not the best but you get what you pay for. Works very well. Minor adjustments when I use all three at the same time. Good value for money.
These tubes are of very good quality and can perfectly mount on a Nikon Body. Perfect coupling and connections. AF works great . Easy to use and pretty sturdy on the body. I mount my Tokina 100mm F2.8 Macro on this lens and it fits superbly too. Have take some extreme close up snaps and am satisfied by this. Allows me to reach more closer than my macro lens. The rubber threading on the tube provides a good grip for holding as well. Highly recommended.
Kenko Auto Extension Tube Set DG with 3 Rings for Nikon - beautifully engineered. I have a cheaper set that "sticks" and is difficult to attach and remove. The Kenko is much easier to use.