In a device for mounting and functional verification of roll fittings (4) in rolling mill stands (1), at least a partial number of the roll fittings (4) forms a respective module (5), and the modules (5) are arranged, for pre-assembly with functional verification, on a mounting plate outside of the roll stand (1), with the modules being adjusted and/or verified, and at least one adjusted and/or verified module (5) is operatively arranged between two rolling mill stands (1), primarily, in the stand gap (9) and is arranged on a base frame (8) at constructively fixable support points (10).