Rotary cutting insert and tool having axial locking member

A cutting insert of a rotary drill tool for cutting metal comprising:

• a head and a neck extending along a longitudinal axis, the head having an axially forward facing cutting region and the neck having an axially rearward facing mount region, wherein at least the neck is arranged to be releasably mountable within a jaw of a support body, the head having generally axially rearward facing axial support surfaces projecting radially outward from the neck for abutment with corresponding axial support surfaces of the support body wherein the head is formed by a pair of generally diametrically opposed lobes projecting radially outward from the axis;
• and
• at least one radial projection extending from a radially inner surface or region of the head and positioned in a circumferential direction between the lobes.