Includes one set of external and one set of internal jaws. Front mount chucks are designed to be used with rotary tables, dividing heads and other devices where back mounting chucks can’t be used. Easily mount on table, dividing head, fixture, or indexer. Lathe chuck wrench supplied. D gripping range is 3-160mm. Gripping range is 48-150mm. Supplied with 3 M10 mounting screws. Adapter plate on dividing head must be machined to use this chuck.