The head portion of the fastener comprises {HEAD ~ a beveled ring gear} 92 which is similar in structure to the ring gear 14 of the fastener 10 and is engageable with a pinion type gear 94 of {TAIL ~ the drive tool} 
The head portion of the fastener comprises { HEAD ~ a beveled ring gear } 92 which is similar in structure to the ring gear 14 of the fastener 10 and is engageable with a pinion type gear 94 of { TAIL ~ the drive tool }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD 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 OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL