Abstract: A non-planar body (1) comprising a dome body (2) having an apex (3) and an outer periphery, the apex (3) located on a first plane (4) and the outer periphery located on a second plane (6) substantially parallel to the first plane (4). A peripheral body (5) extends at least partially around the outer periphery of the dome body (2), and at an angle (7) of less than 180° with respect to a tangent (8) relative to the dome body (2) at the outer periphery of the dome body (2), the angle (7) being measured at an outer surface of the dome body (2). Any of the dome body (2) and the peripheral body are formed from polycrystalline diamond.

Abstract: A unit including a plurality of tool inserts, such as used in saw blades for use in woodworking. Each insert defines a working region and is adapted to be secured to a tool to present that region with a predetermined orientation. A body defines a plurality of discrete zones, each zone having an insert located therein such that the orientation of the working portion at each insert in the zone is the same.