In an arrangement for metal working by rolling, comprising parallel shafts, sector dies mounted on said shafts and devices for adjustably rotating the sector dies and for transmitting rotary motion to the sector dies from the shafts, said devices being mounted on said shafts and being reciprocable therealong, wherein the improvement comprises each of said devices for adjustably rotating the sector dies and for transmitting rotary motion thereto from the shafts comprises a sleeve having external and internal surfaces and provided with teeth extending on the external and internal sleeve surfaces at an angle relative to the sleeve axis, the teeth of one of said surfaces extending in opposition to the teeth of the other of said surfaces and differing in number by at least one tooth, each of said shafts provided with first spline means for receiving the teeth of the sleeve extending on the inner surface thereof, and each of the sector dies provided with second spline means for receiving the teeth of the sleeve extending on the outer surface thereof.