In {TAIL ~ fact}, {HEAD ~ the holes} 50 can be formed with threads to receive the inserts 
In { TAIL ~ fact } , { HEAD ~ the holes } 50 can be formed with threads to receive the inserts
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH