Still, this Proxxon profession model appears to offer some noticeable improvements. The manufacturer claims that this model can be use for extended periods when polishing, grinding, cleaning and engraving -- without becoming overheated. That is one problem I have had in the past, but I think I pushed the poor Dremel too far.
Like the better models of Dremel rotary tools, this Proxxon can be run at a range of speeds from 5,000 to 20,000 RPMs. Variable speed is a an important feature in any make of rotary tool.
Finally, the Proxxon features a die cast aluminum head which serves as a study housing for the steel spindle, running within a ball bearing assembly. This strikes me as more robust than most Dremel tools.
The unit comes with six collets (sized 1/32", 1/16", 5/64", 3/32", 7/64" and 1/8") and is compatible with a number of Proxxon accessories such as a foot switch, flexible shaft, and drill stand.
Here is a link to the Proxxon 38481 IB/E Professional Rotary Tool
Note: Those of you who know you will be using a rotary tool a lot, should consider something like the Foredom rotary tools that jewelers and serious woodcarvers use.