Best Extra Long Drill Bits for Deep-Hole Drilling (2026)
We selected extra long drill bits by evaluating shaft length (18" options), material/coating (HSS, black-oxide, DWDDL), user ratings, and price-to-value for deep-hole drilling tasks
This roundup covers extra long drill bits designed for deep-hole drilling, focusing on long-reach high-speed steel options and common coatings used in industrial and workshop settings. Picks were chosen for shaft length, material and coating (HSS, black oxide, DWDDL series), user ratings, and value for deep drilling tasks
Top Picks
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1
27/64" x 18" high speed steel drill bit, extra long DWDDL
High-speed steel drill bit with extra length for reach. Provides hardness and toughness with lubricity from black oxide coating. Customers note sharpness and long flute length, with mixed durability feedback
- extra-long reach
- black oxide lubricity
- round shank versatility
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2
19/64 x 18 in high-speed steel extra long drill bit
High-speed steel drill bit with extra length for reach. Features black oxide for lubricity and coolant pockets near the edge; round shank for versatile toolholding. Customers note long flute length but mixed durability and sharpness
- extra-long length
- black oxide lubricity
- round shank versatility
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3
9/16" x 18" high speed steel extra long drill bit
High-speed steel drill bit with extra reach for general drilling. Combines hardness and toughness with black oxide finish to reduce friction and help coolant retention near the cutting edge. Customers note sharpness and quality, with mixed durability and accuracy insights
- extra long 18" reach
- black oxide surface for lubricity
- sharp, high-speed steel bit