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