The lock bolt which is driven by the key to fasten a door, strongbox, etc. has a notch on the slope of the front end thereof to protect against {HEAD ~ insertion} of {TAIL ~ a pry} 
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The lock bolt which is driven by the key to fasten a door , strongbox , etc . has a notch on the slope of the front end thereof to protect against { HEAD ~ insertion } of { TAIL ~ a pry }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL