Sintered metal bonded segments with an abrasive action, for tools

Sintered metal bonded segments with an abrasive action, containing particles of hard material, for tools for machining or cutting hard and/or brittle materials with a tool support which accommodates the segments, which segments are made up of individual segment modules that are variously constituted, characterised in that the segments are constructed from segment modules presenting alternating concentrations of hard material particles starting from the leading area and progressing towards the trailing area of the segment in the direction of motion of the segment, and/or from segment modules including varying areas having alternating concentrations of hard materials that are arranged perpendicularly to the direction of motion of the segment.