Crime prevention screw, embedding material of screw head, screw-use crime prevention seat and crime prevention screw set

摘要

A crime preventing screw having a recessed portion for receiving the end of a driving tool. The recessed portion is formed with a recessed engagement portion at a partial lace of an inner wall. An embedding material for embedding in the recessed portion of the screw has a shape and size such that it can be buckled in and can be embedded in the recessed portion.