Dremel EZC481 3/32-Inch EZ Change Collet for the Dremel 4200 Unique designed replaceable collet for 4200 Rotary Tool with EZ Change mechanism This collet cannot be used in any other Dremel rotary tools Grooves designed around the outside diameter to identifies collet size (see 4200 Tool Manual for reference) EZ Change collets are not compatible with the 225 flex shaft attachment and the 575 right angle attachment