The holder can be provided with {HEAD ~ a sheet} of abrasive material in order to permit surgical instruments to be cleaned during the course of {TAIL ~ an operation} 
The holder can be provided with { HEAD ~ a sheet } of abrasive material in order to permit surgical instruments to be cleaned during the course of { TAIL ~ an operation }
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 TAIL TAIL TAIL TAIL TAIL TAIL