These openings can be holes or small bores extending from {HEAD ~ the top surface} through the bottom surface of {TAIL ~ the base member} 
These openings can be holes or small bores extending from { HEAD ~ the top surface } through the bottom surface of { TAIL ~ the base member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL