This 3" spindle assembly is substantially larger, and heavier than the standard spindles which comes with the Jet Benchtop Osciallating spindle sander. The advantage to having a larger drum is that it creates a flatter surface where the crown meets with the wood. That creates a smoother surface on larger pieces. The smaller spindles that come with the unit, range from the 2" on down to the smallest ones, which are great for getting into smaller corners etc, but on a large flat or gradual curved surface they can create dimples in the surface if you don't keep the material moving. br Is the 3" spindle neccessary? Not really, with a careful technique, you can accomplish it with the smaller spindles, but it definitely makes it easier. Highly recommended.

This kit gives you a whole different range of capability with your Jet sander. Take this kit, put your sander on a stable tool stand, and then pat yourself on the back for the money you saved by not buying a floor model sander. With this kit, your sander tackles a much broader range of tasks.pI highly recommend it!

I just received my spindle assembly and was very impressed with it. In fact I agree with most of the other reviews. It seems to be well made and has a good feel to it.
br /However, when I unpacked it, I looked for the missing table insert. After research, I discovered it is optional.
br /While I admit the table insert is optional for larger pieces, most of us are safety conscience and wouldn't consider working with something that put our hands in danger. It is my opinion that the table insert is worth the ten bucks. I recommend you order one as well. (Jet 709539)
br /

It is heavy and well made. Comes with one sleeve. It was a wait to obtain. Seems to have limited availability. Great for
br /straight edges. Sleeves are also tough to find other than from Jet.