When choosing a 1/16″ left-hand drill bit, the key is durability, fast cutting, and the ability to work with damaged fasteners or tough metals. This guide highlights five top options best suited for removing broken bolts or screws and for precision drilling in stainless steel and other hard materials. The selections vary by material composition, point design, and whether the set includes multiple sizes or a single left-hand bit for targeted tasks. Ideal buyers include DIY enthusiasts, machinists, and technicians dealing with stubborn fasteners or requiring reliable left-hand performance.
Summary of selected products:
| Product | Brand | Best For | Notes |
|---|---|---|---|
| 15PCS M35 Cobalt Left Hand Drill Bits Set | VALYRIANTOOL Store | Damaged stubs, bolts, and screws; varied sizes | High durability, 1/16″ to 3/8″ |
| 13Pcs(1/16″-1/4″) Cobalt Left Hand Drill Bit Set | MACXCOIP Store | Broad size range; versatile metals | 135° tip; good for fast cutting |
| KnKut 1/16 Fractional Jobber Length Left Hand Drill Bit | KnKut | Stainless steel and titanium alloy | Walk-free 135° split point |
| Cobalt Left Hand Drill Bit Set, 13Pcs | DUALFERV | Hard metals and plastics | Cobalt HSS with TiN coating; left-hand |
| Drill America DWDLH1/16P12 1/16″ Left Hand Drill Bit | Drill America Store | General purpose with left-hand design | Pack of 12; HSS tools |
15Pcs M35 Cobalt Left Hand Drill Bits Set
The set covers 1/16″ to 3/8″ sizes, featuring a 135-degree split point for self-centering and fast drilling. The M35 cobalt steel design increases durability for hard metals and stainless steel, making it well suited for removing damaged stubs, bolts, and screws and for drilling pilot holes. Best for: professionals or serious hobbyists who need a durable, broad-size left-hand option. Caution: ensure proper clamping to prevent bit slippage during heavy-duty use.
13Pcs(1/16″-1/4″) Cobalt Left Hand Drill Bit Set Jobber Length
Contains 1/16″ through 1/4″ sizes with left-hand design that can work with a screw extractor. Made from M35 cobalt drill bit material for cutting through stainless steel, iron castings, copper, aluminum, and more. Best for: users needing extensive size coverage and compatibility with screw extractors. Caution: performance varies with very hard alloys; ensure proper feed pressure to avoid bit binding.
KnKut 1/16 Fractional Jobber Length Left Hand Drill Bit
Highlights a 135° split point that starts on contact and resists walk-off, with a design suitable for stainless steel and titanium alloy. Best for: users who want reliable non-walking performance and fewer tool changes. Caution: may eliminate the need for a screw extractor in some cases but verify material hardness before use.
Cobalt Left Hand Drill Bit Set, 13Pcs
Equipped with cobalt high-speed steel and a titanium nitride coating, these bits offer high hardness and reduced friction for easier penetration of hard materials. The 135-degree double-edged design provides precision and reduces runout. Best for: users drilling hard metals and plastics with consistent results. Caution: perform gradual drilling to manage heat buildup with cobalt bits.
Drill America DWDLH1/16P12 1/16″ Left Hand Drill Bit
Pack of 12 high-speed steel left-hand drills, uncoated for general purpose use and round shanks compatible with multiple toolholding systems. Best for: broad compatibility with standard drill chucks and simple tasks. Caution: may not deliver optimal performance on extremely hard metals without cobalt content.
Buying Guide
- What sizing range do you need? If you frequently encounter a variety of fastener sizes, a multi-size set (like 1/16″ to 1/4″ or 1/16″ to 3/8″) provides the most flexibility for damaged screw extraction and pilot hole work.
- Material composition matters. Cobalt alloys (M35 cobalt) offer higher hardness for stainless steel and hardened metals, whereas standard HSS may suffice for softer tasks but wear faster on hard materials.
- Left-hand design impact. Left-handed bits help to start aggressive cuts and assist in removing damaged screws when paired with a screw extractor or a reverse-torque setup. Consider if you need this paired with extraction tools.
- Tip geometry. A 135-degree split point improves self-centering and reduces walking. This is helpful for precise hole placement and faster drilling in hard materials.
- Coatings and heat management. TiN coatings reduce friction and heat, which extends bit life in tough metals. For high-heat environments, consider cobalt with protective coatings.
- Usage cautions. Always clamp securely, use appropriate drill speed, and avoid applying excessive pressure to prevent bit breakage and bit wandering.
- Compatibility. Ensure your drill chuck accepts the bit shank diameter you are buying. Most sets use standard round shanks compatible with common drill presses and hand drills.
FAQ
- What does “left-hand drill bit” mean? A left-hand drill bit is designed to cut in a reverse direction, which helps back out broken fasteners or screws when used with the drill in reverse.
- When should I choose cobalt bits? Choose cobalt bits for drilling through stainless steel, cast iron, and other hardened metals where standard high-speed steel may wear quickly.
- Are 135-degree tips better for hard metals? Yes, 135-degree tips center quickly and reduce drift, resulting in cleaner holes in hard materials.
- Can left-hand bits work without a screw extractor? They can, but a screw extractor is often used in tandem to remove stubborn fasteners. Test fit first.
- What is the advantage of a coated bit? Coatings like TiN reduce friction, lower heat, and extend bit life during repeated drilling in hard metals.
- How many bits should I keep on hand? For most DIY and professional tasks, a 5–13 piece left-hand set plus a broader range is a practical balance between coverage and cost.