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