Dremel 4486 MultiPro Keyless Chuck
The Dremel MultiPro chuck allows you to quickly and easily change accessories on your Dremel MultiPro rotary tool without having to change collets. It accepts accessories with 1/32-Inch to 1/8-Inch shanks and is for use with Dremel rotary tool models 275, 285, 395, 398, 750, 770 and 781.The thread size is 0.280" - 40".