ITEM IS AN END MILL SILVER SOLDERED INTO A HARDENED STEEL TOOL HOLDER;END MILL MACHINES FINAL OPENING IN COMBUSTION CHAMBER OUTER LINER FOR A REPLACEMENT IGNITER GUIDE;TOOL HOLDER PROVIDES ANOTHER DIAMETER PILOT FOR COMPANION FIXTURE AND PROVIDES END PILOT FOR A DRILL CHUCK;WT 1 LB;PLASTIC FOAM SHIPPING AND STORAGE CONTAINER INCLUDED;SERD 0139;0.762 IN. DIA CUTTER RQRD FORMACHINING FINISH SIZE OPENING IN OUTERCOMBUSTION LINER