This is not a Vine program item. I paid for this out-of-pocket.Pros: Everything you need is in the package. While this is not a high-precision item, It functioned perfectly. It installed easily on the 1/2 inch shaft of my 1/4 hp motor. I tried it out with a 6 inch buffing wheel and a six inch wire wheel. It ran very smoothly. I really can't say that it was completely without vibration, but I saw no effect on the wheel operation or on the motor.Cons: None as to the actual use of the adapter. BUT, as noted by an other reviewer, the threaded shaft and nut are propriety to the manufacturer and not any standard thread size. This means that you can't buy or thread another nut if you lose or damage it. Another drawback is that you get only one nut, which means you have no available replacement and you can't adjust the position of the wheel further out on the threaded shaft away from the motor body so as to have more working room.Conclusion: The is a bargain price for a very versatile decently made arbor adapter. I liked it so much that I ordered a second one and had the same results as with the first. I did not have any of the quality control issues mentioned by other reviewers. I'm getting a whole new use out of my motor. It's worth the buy.TO THE MANUFACTURER: Please improve this item by using a common standard thread size, Metric, SAE, or other. Please also include another nut in the package. Or, at least provide a way to obtain replacement parts, specifically the nut for the threaded shaft and the set screws to secure the attachment to the motor shaft. Make this into the 100% well-designed product it should be.