Each arm has an outer border 70 and a pair of opposite sides 72, 74 that extend largely radially from the axis 24 of {HEAD ~ the polygon}, and {TAIL ~ each arm} forms a cutting edge at the intersection of the outer border and each side of the arm 
Each arm has an outer border 70 and a pair of opposite sides 72 , 74 that extend largely radially from the axis 24 of { HEAD ~ the polygon } , and { TAIL ~ each arm } forms a cutting edge at the intersection of the outer border and each side of the arm
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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH