This Adapter is for use with Nicad Snapon tools to Milwaukee M18 batteries (Will not fit Snapon Lithium tools)This allows you to use the tools listed below with an M18 battery. It is 3d printed in PETG. It fits models drill CDR4850, 1/2 impact CT4850HO, Flashlight CTLED4918, Sawzall and grease gun. Will NOT fit the 3850 series that the battery goes into the handle. Adapter must be removed before charging.