Brush Head Attachment

Brush head attachment, in particular for an electric sonic toothbrush, comprising a shank member carrying a bristle bundle, and a coupling member (1) provided on the fastening-side end of said shank member with at least one connection surface for a drive shaft of said handpiece which, when a brush head attachment is mounted on a handpiece, protrudes into said coupling member (1), a spring element that can be operatively connected with said drive shaft for securing said drive shaft to said brush head attachment and/or transferring a drive motion of said drive shaft to said brush head attachment, and a metal ring (4) disposed in a widened fastening foot (2) formed by said coupling member (1), wherein said metal ring (4) is a die-cast member made of zinc forming a flange region (5) from which a pin section (6) extending into said coupling member (1) projects away, and from which a ring surface (7) projects at the opposite side, the outer diameter of which is smaller than the outer diameter of said metal ring (4), wherein said ring surface (7) changes via a phase (9) to a uniform cylindrical inner circumferential surface (10) of said metal ring (4).