In this way, a roll having {HEAD ~ an outer circumferential surface} of {TAIL ~ three different radial heights}, when measured from the axis of the roll, should be understood as having a base surface and a first and second element, which correspond to the three surfaces respectively 
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In this way , a roll having { HEAD ~ an outer circumferential surface } of { TAIL ~ three different radial heights } , when measured from the axis of the roll , should be understood as having a base surface and a first and second element , which correspond to the three surfaces respectively
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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 OTH OTH OTH OTH OTH OTH