insert and a tool holder of a rotatingly driven tool wherein the tool holder has bearing surfaces by which forces or torques are transmitted to the tool insert wherein the tool insert is made from a material harder than that of the tool holder and by sintering a green compact of powder a sintered green compact for the tool insert is used as a hob by which the bearing surfaces in tool holders are manufactured by punching or press forming application_number US 48645206 A description while this invention may be embodied in many different forms there are described in detail herein a specific preferred embodiment of the invention this description is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiment illustrated in fig1 a sintered green compact 10 can be recognised which has a cylindrical body 12 the one end surface of which is provided with gear teeth 14 the green compact 10 is formed from a hard metal or tool ceramics and serves as a profile element for a thread former according to de 101 36 293 a1 described above for instance for this purpose a green compact body corresponding to the green compact according to fig1 is cutting processed in order to provide it with a suitable tool profile cutting edges grooves and the like however in the method described below such processing is not undertaken with the green compact 10 instead it remains unprocessed and is taken as a hob for a stamping operation as is known the green compact 10 is produced in a powder press by means of an upper and a lower stamp which co operate with a die the gear teeth 14 are usually formed by the suitably formed lower.