The anchor has {HEAD ~ a first open end} and a second closed end and also has an internally threaded portion for receiving {TAIL ~ the bolt} 
The anchor has { HEAD ~ a first open end } and a second closed end and also has an internally threaded portion for receiving { TAIL ~ the bolt }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL