The presence of {TAIL ~ the intermediate layer} also allows the use of a cutting tool terminating in {HEAD ~ a cylinder} that has a blunt cutting edge, in addition to tools terminating in cylinders that have sharp cutting edges 
The presence of { TAIL ~ the intermediate layer } also allows the use of a cutting tool terminating in { HEAD ~ a cylinder } that has a blunt cutting edge , in addition to tools terminating in cylinders that have sharp cutting edges
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH