Ideal for diy hobby and model enthusiasts the clarke crt40 multi purpose rotary tool kit will shape engrave grind clean sand polish sharpen and cut at a maximum operating speed of 33 500rpm allowing you to work with an excellent level of accuracy care and attention to detail the crt40 kit is especially good for intricate and small scale work that larger rotary tools may struggle with included in the kit is the 135 watt rotary tool carry case 1 metre long flexible drive heigh