The TiNAl coating on these drill bits provides a low-friction surface on the tool and is suitable for drilling most materials. Carbide drill bits provide excellent hardness, wear resistance, and heat resistance, but they require a rigid setup such as a drill press. This listing is for each. Technical Specification Item Step Chamfer Drill Bit Material - Machining Carbide Finish - Machining TiNAl Drill Bit Size 1/4 in Decimal Equivalent 0.2500 Measurement System Fractional Inch Chamfer Angle 90 Degrees Drill Bit Point Angle 150 Degrees Flute Length 1 5/16 in Cutting Direction Right Hand Overall Length 3 1/2 in Depth:Dia. Ratio 2xD Drill Bit Grouping Individual Drill Length Class Jobber Length Shank Type - Machining Straight Shank Dia. 10.00 mm Shank Length 1.575 in Series X.treme Pilot Step 90 Standards DIN 6535 Coolant Fed Coolant Through Number of Coolant Holes 2 Drill Point Length 0.033 in Sheeter Drill No Drill Diameter Tolerance P7 Material Grade - Machining K30F Primary Material Application Aluminum, Brass, Bronze, Cast Iron, Copper, Nickel, Stainless Steel, Steel, Titanium Primary Material Application ISO Code K, M, N, P, S