Dremel EZ Lock 1-Piece mandrel design that simplifies changing accessories. Pull, twist, release. Compatible with all Dremel rotary tools, 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.