The dremel 4000 145 performance multitool set with 45 accessories is the ideal partner for all applications with high requirements at precision and control whether for fine work on wood polishing of chrome or boring of tiny holes in different materialsthe dremel 4000 has full variable speed control of between 5000 35000 rpm giving it the widest speed range for a very broad range of applications there is a separate onoff switch with integrated collet lock out function so that there is