Each of the lateral surfaces 10 is formed with {HEAD ~ a rectangular fixing recess} 12 reaching the top surface 11 and {TAIL ~ the bottom surface} of the main body 1 
reaching
Each of the lateral surfaces 10 is formed with { HEAD ~ a rectangular fixing recess } 12 reaching the top surface 11 and { TAIL ~ the bottom surface } of the main body 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH