I have a B+Q one that`s about 8-9 yrs old now,was sold as a plasterboard trimmer,with added flexydrive,it has a 700 watt motor,and i just got a Dremel chuck adapted at an engineering co. to fit the thread on my flexydrive,cost £29 but worth it with the time it saves changing collets.The speed range is 20.000-35.000 rpm,I`ve found the Proxxon solid carbide mill/drill cutters work really well at these speeds and no heat build up like you get with highspeed steel,I use the 1 mm and 2 mm cutters,found the 3 mm cutters do their own thing as their to hard to control without the router adapter fitted.