500-65/16 500-6 Extra Length Aircraft Extension Drill

Aircraft extension-length drill with straight shank, diameter 0.3125" (5/16) with an overall length of 6" and flute length of 3.3/16" according to NAS907 Type B standard with 135° heavy duty split point, HSS with steam tempered finish for 4xD drilling without pecking in steel, stainless steel and cast iron