These are professionally manufactured lead screws for use in 3D printers and other CNC machines or robotics projects. The trapezoidal design produces smooth transfer of rotational force into linear movement of the included brass nut. The dissimilar metals used (brass for the nut / steel for the rod) do not stick together, providing an extremely low friction and long life.
Length is 300mm, and diameter is 8mm.
Includes two each lead screw and brass nuts.