These are the Dremel EZ Lock Carbide Cutting Wheels.                
                                                                              
FEATURES: Fits #EZ402 (DRER4930) mandrel used with Dremel rotary tools        
          Easy installation-just pull, twist and release                      
          One-piece mandrel design simplifies the process of changing cutting 
            wheels and makes it easy to cut through wood and laminates        
                                                                              
INCLUDES: One Dremel EZ Lock 1-1/2 Carbide Cutting Wheel                      
                                                                              
REQUIRES: Installing on mandrel and fastening to rotary tool