Abstract: Bench tool mounting apparatus has a single rectangular outer part for fixing to a work bench work station and that defines three interior three-dimensional orthogonally contiguous marginal areas adjacent three outer part sides and center openings on a fourth side. There are also a plurality of inner identical parts, each for having a bench tool fixed thereon and each defining three three-dimensional marginal projections adapted for each to slidably engage in the marginal areas of the single outer part through the center openings thereof and thereby securely mount a bench tool on the work bench. A pair of bolts engage respectively in vertically aligned and spaced-apart bolt holes defined through an inner part marginal projection and an outer part defining an adjacent marginal area to lock the inner and outer parts together.