A protective glove for a human hand includes an inner glove of polyester nonwoven needlepunched material and a coating thereon. The bottom end can be folded to reduce the size of the bag, with the folded end discreetly hidden under the cover sheet. The sight base assembly includes a vertical plate having locating arms which engage the side walls of the rifle receiver. Additionally, the rotation of the light guide plate further expedites the photocatalysis so as to enhance the reaction efficiency of the photocatalytic reactor. The method includes: providing a substrate including a buried oxide layer; forming patterns, which includes an opening part to expose the substrate, by etching the buried oxide layer; forming a germanium single crystal layer in the opening part; and forming an optical coupler, which is adjacent to the germanium single crystal layer, on the substrate. A fastening portion in which the bridge wire is welded to the contact pins is provided at each of the contact pins.