Somthing that is not slow speed!Not sure in honesty.I have a 150 rpm numatic but want to buff some marble (I think) so I guess I need a faster machine.whats this one like??http://www.ebay.co.uk/itm/181041731495?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649Cheers H