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This came with a 2" disc. The question of air power is not a problem for me as I am set up for lots of air. These pads are helpful to keep the original pad on the machine from getting worn down. As an aside comment, there are intermediate pads that can be placed between the H/L surface that allow different degrees of float for different curves etc. great tool, this fits my small hand. 3" is available and the discs readily screw on and off with the wrench that comes with the kit. These pads are available at a number of places that sell the sand paper. Also 2 different length extensions are available for deep bowel sanding.
I would further comment on a review I read BEFORE buying this tool. It works very well for the purpose for which I bought it- working in tight places. A larger system would be better. I have a 6 Hp/ 33 gallon compressor and it works OK for this tool. I really like this tool. IT DOES REQUIRE A HIGH VOLUME OF AIR. So, if you wish to use this tool with a small volume compressor, you may be dissapointed in the performance of this tool. A "kiddie compressor" will not do.
In the Canadian Woodworking magazine (Aug/Sep 08) it states this sander "is one of the few air sanders that can be operated on a portable air compressor" this is NOT true. I am sorry I bought this sander. This sander works less than one minute with a portable air compressor. I discovered later in the Woodcraft October Catalog that they note the sander requires a minimum of a 60 gallon capacity compressor or equiivalent to operate.
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