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