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