E6545/16 UNF Combi Taps Spiral Flute 30°

Combination drill-tap with a 30° spiral flute, for Unified National Fine thread UNF 5/16" with 24 TPI and Medium class of fit, dimensions according to DORMER-DIN standard with 8.0mm shank and 6.3mm square drive, HSS with steam tempered surface finish and 30° helix angle for 1.5xD through hole threading in free machining steel