Abstract: This invention concerns a device (10) to replace rolls (11) and/or apparatus (12) on rolling stands (25-26) having rolls (11) supported at one end, which device is able to cooperate with static support stand means (25-48) and is moved by crane or bridge crane means, possibly with a rotatable turret (33), and comprises frame means (110) with hook means (23), jaw means (16) with means (20) to engage rolls, and actuation means (17), such device comprising also means (22) to engage apparatus, the reciprocal positioning of parts (11-12-13) when engaged by such device (10) being substantially the same as the reciprocal positioning of such parts (11-12-13) when fitted to the rolling unit (25-26).