CROWN Chucks 16 Steel Front Mount 4 Jaw Independent Lathe Chuck & T Slots. Bore Dia - 3.800. Over All Height - 5 1/2 Inc Jaws.
Mount - 7 7/8" x 0.300" Deep Front Mounted With 4x 5/8" Holes On 6" PCD. Key Size - 1/2 Square.T Slots Are For 5/8 T Nuts. Cannot see what you are after...