{HEAD ~ The taper bit} 16 is formed at the fore end of {TAIL ~ the smaller diameter parallel thread part} 15 
{ HEAD ~ The taper bit } 16 is formed at the fore end of { TAIL ~ the smaller diameter parallel thread part } 15
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH