The miter 3, wherein {HEAD ~ the main body} comprises {TAIL ~ a rotary shaft} extending in a second direction perpendicular to the first direction and parallel to the upper surface, the extension member having an extension upper surface, 
comprises
The miter 3 , wherein { HEAD ~ the main body } comprises { TAIL ~ a rotary shaft } extending in a second direction perpendicular to the first direction and parallel to the upper surface , the extension member having an extension upper surface ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH