Home » Tender for Supply Of Solid Carbide Drills With A Diameter Of 4 Mm, A Flute Length Of 20 Mm, And An Overall Length Of 70 Mm. The Drills Feature A Shank Diameter Of 4 Mm And A Self-centering Geometry, Designed For Durability With A Multilayer Tialn Coating. Solid Carb, India