Home » Tender for Supply Of Self-centering Micrograin S/c Drills With A Diameter Of 19.90 Mm, A Flute Length Of 45 Mm, An Overall Length Of 100 Mm, And A Shank Diameter Of 19.90 Mm. The Drills Are Designed For Use With Materials Up To 45 Hrc And Are Coated For Enhanced Dur, India