BORING PREVENTING DEVICE AND WALL CONTAINING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a boring preventing device capable of preventing such a crime as to form a through hole in a door with a hole saw or the like. SOLUTION: This boring preventing device 1 is provided with a large number of spheres 10 arranged between an outer surface 103 facing the outside and an inner surface 104 facing the indoor side in a door 101 and arranged almost parallel with the outer surface 103, and a holding part 20 for rotatably holding these spheres 10. COPYRIGHT: (C)2006,JPO&NCIPI