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