Abstract: A cleaning tool has a tray 10 and a cover member 20. The tray has a space for individually accommodating a to-be-cleaned object D. The cover member has a frame 21, and thread-like members 22 and 23. The thread-like members 22 are tensioned to the frame along a first direction so as to form a first plane section that defines the top portion of the space. The thread-like members 23 are tensioned to the frame along a second direction so as to form a second plane section above the first plane section. When the thread-like members 22 are about to vibrate during the cleaning, the thread-like members 22 are about to vibrate during the cleaning, member can relatively freely move in each plane section.

Abstract: A grinding jig set comprising a combination of several jig units and a method for grinding a number of objects are provided. The method comprises a series of steps from arranging the objects to be ground on a grinding jig (a master plate) through removing the ground objects from the grinding jig after completion of grinding process, smoothly and precisely without damaging a number of the objects to be ground and without altering the arrangement pattern of the objects to be ground from the start through the end of the series of steps. The jig set for grinding comprises a set of jig units used for a series of processing from allocation of objects to be ground on a grinding jig through removing the ground objects from the grinding jig after the grinding operation.