A polishing tool unit (1) includes a brush-shaped grinding stone (4) and a tool holder (2). The tool holder (2) includes a shank (2a), a sleeve (6), a gear screw (30), and a nut (36). The nut (36) is screwed onto a bolt portion (34) of the gear screw (30). The brush-shaped grinding stone (4) is connected to the front side of the nut (36) and held by the tool holder (2). The gear screw (30) is rotatable relative to the shank (2a) and the sleeve (6) about the axis (L). While rotation of the nut (36) about the axis (L) is regulated, the gear screw (30) is rotated, whereby the nut (36) is moved and the protruding amount of linear grinding members (3) is adjusted.

A surface treatment tool comprising an annular carrier substrate and a plurality of abrasive lamellae connected to the carrier substrate by their narrow sides in a contacting side-by-side arrangement or juxtaposition of their flat sides, at least some of which are fiber fleece lamellae. The carrier substrate is a flexible belt, the ends of which pointing in the longitudinal extension of the belt are connected to one another to form an annular shape. The fiber fleece lamellae are connected to the outward-facing surface of the flexible belt by means of an adhesive connection with flexible material properties in a state in which the lamellae are elastically compressed with respect to their thickness.

A modified honing brush is provided comprising one or more bristles and one or a plurality of reusable stackable plates having one or more holes or voids located in the plates, or one or more support guides, and wherein each of the bristles is independently fitted through one or more of the holes or voids of the plates or surrounded by one or more support guides.