Left Hand Drill Bit Set vs Screw Extractor: Which Removes Broken Bolts?
By Drill Hog® | Published: 2026-10-24
Category: Comparisons
Compare left hand drill bits and screw extractors for removing broken bolts. Learn when to use each method and the key trade-offs to get the job done.
Quick answer
For most broken bolts, start with a left hand drill bit set because the reverse twist often backs out the bolt without needing an extractor. Use a screw extractor only when the bolt is seized and drilling alone fails.
Why left hand drill bits work first
Left hand drill bits rotate counterclockwise, the same direction you turn a wrench to loosen a bolt. As you drill into the broken fastener, the bit's reverse twist can grab and spin the bolt out on its own. This is the cleanest removal method because it avoids the extra step of inserting a separate tool.
The Drill Hog 58 Pc Left Hand Drill Bit Set includes 29 right hand fractional sizes from 1/16" to 1/2" by 1/64ths, giving you the range to match most bolt diameters. The HI-Molybdenum M7 construction adds durability when drilling into hardened steel.
When a screw extractor becomes necessary
A screw extractor set works after you drill a pilot hole with a standard (right hand) bit. The extractor is then inserted and turned counterclockwise to grip the bolt from the inside. This method is reliable for bolts that are rusted, torqued, or otherwise stuck tight.
The trade-off is that extractors can snap if too much force is applied, leaving you with an even harder removal. They also require a separate drilling step and the right pilot hole size for each extractor.
Trade-offs at a glance
- Left hand drill bits: Drill counterclockwise; the bit itself may remove the bolt without a second tool. Works best on bolts that are not fully seized. Start here for most broken bolts.
- Screw extractor set: Requires a pilot hole, then inserts a tapered tool that grips the bolt interior. More steps, but more grip for stubborn fasteners. Use when left hand bits fail to back the bolt out.
- Combined approach: Drill with a left hand bit first. If the bolt does not come out, the hole you just drilled is already the correct pilot hole for an extractor. Saves time and avoids drilling twice.
Product facts
- Drill Hog 58 Pc Left Hand Drill Bit Set Left Hand Drills Reverse Twist Moly M7: Drill Hog® 58 Pc HI-Molybdenum M7 Drill Bit Set includes 29 right hand fractional sizes from 1/16" to 1/2" by 1/64ths. The wide size range lets you match the bolt diameter closely, increasing the chance the reverse twist will back it out without needing an extractor.
Drill Hog 58 Pc Left Hand Drill Bit Set Left Hand Drills Reverse Twist Moly M7
Which method fits your job?
Best for
- DIYers and mechanics who want the simplest removal method with fewer tools
- Jobs where the bolt is not rusted solid and may back out easily
Not for
- Bolts that are completely seized or have damaged heads requiring maximum grip
