CO501-12N21 CO501-12 Extra Length Aircraft Extension Drill

Aircraft extension-length drill with straight shank, diameter 0.1590" (N21) with an overall length of 12" and flute length of 2.1/8" according to NAS907 Type J standard with 135° heavy duty split point, cobalt based HSS-E with bronze finish for 4xD drilling without pecking in steel, stainless steel, cast iron and super-alloy