Best Extra Long Drill Bits (2026 Guide)
We selected extra long drill bits based on review volume, high user ratings, consistent HSS or black-oxide construction, and availability across common diameters and lengths
The Verdict
- Best Overall: BOSCH 1-Piece Extra Long Drill Bit 5/16 in x 12 in (Pack of 3) — Best for compact multi-packs: reliable extra-long 12-inch construction for routine deep drilling tasks
- Best Value: 1/2 in x 10 in extra length drill bit (DWDDL series) — Best for general-purpose deep drilling: long 10-inch HSS design that balances rigidity and reach
This guide covers extra long drill bits suited for deep-hole and hard-to-reach drilling tasks, highlighting trustworthy choices across common diameters and lengths. Picks were chosen by aggregating high ratings, strong review volume, and consistent features like HSS construction, black oxide finishes, and trusted brands
Top Picks
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1
Best Overall BOSCH 1-Piece Extra Long Drill Bit 5/16 in x 12 in (Pack of 3)
Best for compact multi-packs: reliable extra-long 12-inch construction for routine deep drilling tasks
Aircraft black oxide drill bit with speed helix for faster drilling in light-gauge metal, wood, and plastic. Per-pack info; longer life and reduced heat. One customer notes good quality and length enough to drill through walls
- faster drilling
- longer bit life
- versatile for metal, wood, plastic
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2
Best Value 1/2 in x 10 in extra length drill bit (DWDDL series)
Best for general-purpose deep drilling: long 10-inch HSS design that balances rigidity and reach
High-speed steel drill bit with extra length for reach and black oxide finish for lubricity. Customers note sharpness and long flute length, with mixed durability feedback
- extra length for reach
- black oxide lubrication
- round shank versatility
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3
DWDDL18X1/8 1/8" x 18" High Speed Steel Drill Bit
Best for precision small-diameter work: 18-inch HSS length that reaches deep holes while maintaining accuracy
High-speed steel drill bit with extra length for reach. Durable with wear resistance and good cutting performance; some users report issues with durability and straightness
- extra long reach for drilling
- black oxide for lubricity
- round shank for broad compatibility
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4
27/64" x 18" high speed steel drill bit, extra long DWDDL
Best for mid-size holes at depth: 18-inch HSS length designed to clear chips and hold a straight line
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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5
Drill America 15/32" x 18" HSS Extra Long Drill Bit
Best corrosion resistance option: black-oxide HSS extra-long bit that resists wear in routine use
High-speed steel drill bit with extra reach for general purpose drilling. Features lubricity from black oxide finish and round shank for versatile toolholding; designed for chip evacuation in counterclockwise/right-hand cut operations. Noted for length and quality with mixed durability/sharpness feedback
- extra-long reach
- black oxide lubricity
- round shank versatility
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6
19/64 x 18 in high-speed steel extra long drill bit
Best for consistent drilling performance: 18-inch HSS geometry that balances chip ejection and strength
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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7
5/8" x 18" HSS Extra Long Drill Bit, DWDDL Series
Best for large-diameter deep holes: heavy-duty 18-inch HSS construction for demanding drilling tasks
High-speed steel drill bit with extra length for reach. Helps with general drilling, features black oxide for lubricity and chip evacuation near the edge. Customers note sharpness and quality, with mixed durability and accuracy feedback
- extra-long reach
- sharpness and quality noted
- round shank versatility
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8
Drill America 17/32" x 18" HSS Extra Long Drill Bit
Best for near-maximum mid-size reach: sturdy 18-inch HSS bit offering rigidity for larger-diameter drilling
High-speed steel drill bit with extra length for reach and wear resistance. Noted for sharpness and quality, though durability and straightness receive mixed feedback
- extra long reach for deep holes
- black oxide treated for lubricity
- round shank for wide mounting compatibility
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9
9/16" x 18" high speed steel extra long drill bit
Best for heavy workpiece penetration: long HSS design built to handle deeper, tougher drilling jobs
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
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10
DWDDL12X3/4 3/4" x 12" HSS Extra Long Drill Bit
Best for wide deep holes at moderate reach: 12-inch HSS extra-long option suited to larger-diameter drilling
High-speed steel drill bit designed for extra reach with good hardness and toughness. Users note quality and sharpness, with mixed durability feedback
- extra-long reach for deep holes
- black oxide coating improves lubrication
- versatile round shank for various toolholders