Includes the 1/2" Drill chuck, 1" X 8TPI threaded adapter, and jaw tightening key. This 3-jaw chuck will mount onto the headstock spindle of any Lathe that accepts 1" X 8TPI threaded accessories. The chuck body has a 1/2" X 20TPI threaded post that screws into the adapter. Perfect for lathes that do not have a Morse taper mount. Great for holding drill bits, small turnings, dowels, pen Mandrel shafts, and much more.