The Dremel EZ Lock makes accessory changes easy as PULL - TWIST - RELEASE. The one-piece mandrel design simplifies the process of changing accessories and makes it easy to cut through a range of materials from metal to plastic. The EZ402 Mandrel is for use with exclusive EZ Lock Accessories. First patented system of its kind The patented EZ Lock system making accessory changes 6X faster than using a standard mandrel by eliminating the need for a screw Compatible with all Dremel rotary tools