Photos show the item you will be receiving. It has a 3/8" (10mM) capacity, and is a keyless chuck with the "Hand-tite" feature. It is manufactured by Jacobs. This fits many, but not all, DeWalt drills. It is best to check your manual for proper chuck replacement sizing. I have a list below to help, but it is probably not complete. Your drill will need a 1/2" mount. Some drill mounts are not 1/2", with 3/8" being a popular alternate size, and this chuck will not fit onto those mounts. This chuck threads onto a 1/2"-20 mount.