an improved cage slip system is disclosed . the cage is constructed so that the cones which actuate the slips extend into the cage openings . the radial extension of the slips is limited so as to retain them if they are extended in an unsupported situation . the cones have a maximum outside dimension equal to the outside dimension of the cage so as to increase the rating of the slips by increasing the bearing area of the cones on the slips . the beneficial features of the cage design are retained while a greater degree of radial expansion of the slips is possible allowing minimization of tool inventory for situations where a lighter wall casing requires further slip extension .