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These drill bits come in sizes expressed in millimeters. They have a TiNAl coating that provides a low-friction surface on the tool and is suitable for drilling most materials. The bits have spiral flutes that evacuate chips as the bits drill into a workpiece, and they have a straight shank that installs into a drill chuck or similar toolholder. This listing is for each. Technical Specification Item Jobber Length Drill Bit Drill Bit Size 3.50 mm Decimal Equivalent 0.1378 Measurement System Metric Material - Machining Carbide Finish - Machining TiNAl Drill Bit Point Angle 140 Degrees Drill Bit Point Type Self-Centering Point Coolant Fed Coolant Through Number of Coolant Holes 2 Flute Type Spiral Number of Flutes 2 Flute Length 28.00 mm Maximum Drilling Depth 23 mm Cutting Direction Right Hand Shank Type - Machining Straight Shank Dia. 6.00 mm Shank Length 36 mm Overall Length 66.00 mm Depth:Dia. Ratio 5xD Drill Length Class Jobber Length Drill Point Length 0.637mm Drill Bit Grouping Individual Series X.treme Inox Standards DIN 6537 Drill Diameter Tolerance H6 Sheeter Drill No Material Grade - Machining K30F Primary Material Application Nickel, Stainless Steel, Titanium Primary Material Application ISO Code M, S Secondary Material Application Aluminum, Brass, Bronze, Composite, Copper, Graphite Secondary Material Application ISO Code N, O, P