The Dremel EZ Lock™ makes accessory changes easy as PULL - TWIST - RELEASE. The patented EZ402 Dremel EZ Lock features a one-piece mandrel, designed to simplify the process of changing accessories. The EZ402 mandrel makes accessory changes 6X faster than using a standard mandrel. Compatible with all Dremel rotary tools the EZ402 should only be used with EZ Lock cutting, sanding, cleaning, polishing, grinding and sharpening rotary tool accessories.