Abstract: Each tool comprises a molded head and a cylindrical shank for supporting the tool in a surfacing machine. In one embodiment the head is semi-spherical in configuration, and a plurality of metal inserts are embedded in the head so that a circular recess, which is formed in one end of each insert to hold a lens blank, opens on the spherical surface of the head with its axis extending through the center of curvature of the head and the axis of the tool shank. In another embodiment the head contains a large semi-spherical recess, and the inserts are embedded in the head so that their recessed ends open on the surface of the spherical recess with the axes of the circular recesses extending through the center of curvature of the spherical recess and the axis of the tool shank. In each embodiment the head is made from a material having a melting point lower than those of the inserts and shanks so that the head can be melted and the inserts and shanks can be retrieved for future use.