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