These general purpose high-speed steel screw-machine length drill bits for metal and plastic have regular spiral flutes that are best suited for nonchipping hard materials such as nonferrous metals, cast iron, and structural steel. Screw-Machine Length drill bits are shorter than jobber-length and maintenance-length drill bits to provide high strength and rigidity for drilling straighter holes than longer drill bits, and provide access to tight spaces where longer drill bits cannot fit. High Speed Steel drill bits absorb more shock and vibration than cobalt and carbide, making them suitable for use in manual drilling machines and handheld power tools. Bright (Uncoated) drill bits can be resharpened and are a good choice when drilling soft materials such as aluminum and low-carbon steel.
| Point Type | Conventional |
| Flute Length | 2-7/8 in |
| Finish/Coating | Bright (Uncoated) |
| Overall Length | 4-1/2 in |
| Measurement System | Fractional Inch |
| Drill Bit Point Angle | 118 Degrees |
| Size Decimal Equivalent | 0.6406 |
| Drill Bit Sizes Included | 41/64 in |