4. IN A WIRE CURVING TOOL OF THE CHARACTER DESCRIBED, THREE ROLLERS CARRIED ON A FRAME; SSID ROLLERS EXTENDING IN ONE GENERAL DIRECTION; AT LEAST ONE OF SAID ROLLERS BEING DIFFERENT IN CROSS-SECTIONAL AREA AT PARALLEL PLANES ACROSS ITS LENGTH; SAID FRAME INCLUDING TWO RELATIVELY MOVABLE PARTS; ONE OF SAID ROLLERS BEING ON ONE OF SAID PARTS AND INTERMEDIATE THE OTHER TWO ROLLERS, AND THE OTHER TWO ROLLERS BEING DETACHABLY MOUNTED ON THE SECOND OF SAID PARTS, MEANS ON SAID SECOND PART FOR ATTACHING SAID TWO ROLLERS THEREON AT DIFFERENT POSITIONS IN RELATION TO SAID INTERMEDIATE ROLLER AND MEANS TO HOLD SAID PARTS IN ANY DESIRED SPACED RELATION.