DWDDL12X5/8X1/2 Size: 5/8" x 12" Features: -Drill bit. -Material: High speed steel. -Extra long. -Decimal equivalent: 5625, 6250, 6250 and 8750. Unit Material: -Steel. Use Material: -Metal. Use: -Drill Bits. Generic Dimensions: -9/16 x 12 Drill bit flute length: 9. -5/8 x 12 Drill bit flute length: 9. -5/8 x 18 Drill bit flute length: 13. -7/8 x 18 Drill bit flute length: 13.