for purposes of this application an interference fit will be defined as one having limits of size so prescribed that an interference always results when mating parts are assembled the definitions of clearance fit and interference fit are consistent with the american standard b 4 1 1955 preferred limits and fits for cylindrical parts once fully inserted into the socket driver 10 the bit driver 38 can be removed by inserting a suitable tool through the cavity 20 and the through hole 36 for the purpose of impacting the bit driver 38 and overcoming the retaining forces due to the interference fit as aforementioned referring to fig6 the theory of operation of the socket driver in accordance with the present invention will be described as will be evident from fig5 the forceful insertion of the bit driver 38 into the cavity 24 an interference fit with the protuberances 34a 34c applies significant forces a which are directed radially outwardly and which act on the interior surfaces 28 33 of the wall 12 the forces a are particularly great where the driven end abuts against the protuberances in pressed fit relationship these forces are referenced a 39 and are generally sufficiently great that they.