The burr is re solidified material inside {HEAD ~ the hole} which can affect {TAIL ~ air flow} through the hole 
affect
The burr is re solidified material inside { HEAD ~ the hole } which can affect { TAIL ~ air flow } through the hole
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH