Best Long Length Drill Bits (2026 Guide)
We selected items by combining product rating and review volume with key features like tip material, length, and intended substrate
The Verdict
- Best Overall: Extension concrete drill bit 39" cross-type carbide for masonry — Best for extreme reach: 39-inch extension with cross-type carbide head for deep masonry holes
This roundup covers long length drill bits for masonry and metal, focusing on extension-style bits and multi-piece cobalt sets suited to deep or hard drilling tasks. Picks were selected by combining star rating, review volume, and product attributes such as carbide tips, cross-type heads, and length to highlight reliable long-reach options
Top Picks
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1
Best Overall Extension concrete drill bit 39" cross-type carbide for masonry
Best for extreme reach: 39-inch extension with cross-type carbide head for deep masonry holes
Extension drill bit, 39-inch total length with cross-type carbide cutter for concrete, brick, cement walls and stone. Customers note good cutting speed and value, with mixed durability feedback
- 39-inch extension length
- cross-type carbide cutter
- compatible with hammer drills
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2
Extension Concrete Drill Bit 30in with carbide head
Best for hammer drills: 30-inch extension with carbide head built for concrete and long-reach applications
Extension concrete drill bit, 30-inch length with cross-type carbide cutter for fast drilling in concrete, brick, cement walls, and stone. Customers note solid build and efficient cutting performance, with some concerns about durability under heavy use
- 30-inch extension for reach
- carbide alloy cutter for efficiency
- double-thread ripple design for speed
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3
Extension Concrete Drill Bit 30in Cross-Type Carbide
Best cross-type option: 30-inch cross-type carbide extension designed for consistent masonry cutting
Extension drill bit with 30-inch total length and cross-type carbide cutter for concrete, brick, cement walls, stone. Noted for faster drilling and durability in hammer drills
- 30-inch extension length
- carbide cross cutter design
- high-strength alloy steel
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4
Extension concrete drill bit 39" cross-type carbide
Best extra-long extender: 39-inch cross-type carbide extension made for deep concrete drilling tasks
Long extension drill bit for concrete and masonry with a cross-type carbide cutter. Designed for faster drilling in concrete, brick, cement walls, and stone. Users report solid build and good cutting speed, with mixed durability feedback
- 39-inch total length
- Cross-type carbide cutter
- High-strength alloy steel
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5
Milwaukee RED Helix Cobalt Drill Bit Set, 23-PC
Best multi-size metal kit: 23-piece cobalt set provides durable bit variety for hardened metals and diverse jobs
Durable cobalt drill bit set for metal and wood projects. Includes 23 pieces with RED Helix design for efficient drilling. Customers report high quality with mixed durability feedback
- 23-piece cobalt drill bit set
- RED Helix design
- quality-focused feedback