A polarizer of the present invention is composed of a film comprising a structure in which fine metallic particles is dispersed in a polymer matrix is characterized in that a polymer forming the polymer matrix is a translucent polymer having a transmittance of 88% or more when measured thereof with a thickness of 1 mm and the film is uniaxially stretched. In particular the cancer to be treated is a brain tumor, more particularly a glioma, more particularly still a glioblastoma multiforme. The external diameter of the connector is the external diameter of the remainder of the extension. In the present invention, the grinding machine is based on a trolley which moves at a uniform height along a surface, and includes a forward \u201cgauge\u201d wheel which controls the relative grinding drum depth based on the wheel position and rotation. The upstream ends are also laterally tapered to reduce the degree of force encountered should a pusher plate catch thereon. A method may include providing a microelectronic die including a conductive bump formed on a bonding pad, and an insulating layer formed on at least a portion of a surface of the conductive bump, and probing the conductive bump to test the microelectronic die.