For fast hook ups on cowls, door post, trunk openings, and etc. The 490 and the 490L adaptors enable you to utilize your present hydraulic set accessories such as the flat head, rubber flex head, extension tube, etc. (optional) The 490F and the 490FL gives you a wider surface for pulling on lighter metal with less distortion. (included) The 490Q is used for pulling wheel openings. (optional)