2Pcs Multi Quick Change Keyless Chuck Replacement for 4486 Rotary Tools 3000 4000 7700 8200

This is an excellent replacement for the collet and cover dilemna that attends each use of one of my Dremel Motor Tools. Over the years I have collected several Dremel tools used in different projects, now mostly for model railroad prouects. I have lost and replaced a number of collets and their covers while changing drill or tool headpieces. I found this online and ordered a pair. I liked them so much I ordered this second pair(why do I have so many Dremels?) They work, they are efficient and simple to install and use. These are highly recommended.