A roller cage (4) is provided for the guidance of a minimum of one work roller (2) of a tool for deep rolling of radii or grooves on crankshaft journals or crank pins, where the roller cage (4) is supported at the end (8) of the long leg (9) of an L-shaped tool holder, and is loosely guided in the longitudinal direction of the long leg (9) in a tab engaging in a longitudinal groove on the underside (13) of the roller cage (4) from the end (8) of the long leg (9). The longitudinal groove of the roller cage (4) has a considerably greater width than the width of the tab.