Abstract: An adjustable slide mold for twin casting installations includes two angular mold parts slidably engaging each other at two contact surfaces. At least one of the mold parts is formed with a projecting arm engaging the opposite mold part at an additional contact surface to divide the extrusion channel into a plurality of parallel extrusion passages. The mold parts are connected to an adjusting drive which uniformly displaces the mold parts relative to each other in opposite directions, so that the centers of respective extrusion passages remain stationary irrespective of the adjustment of their cross-sectional areas.