VALYRIANTOOL 15PCS M35 Cobalt Left-Hand Drill Bits Set – Remove Broken Stubs & Stubborn Fasteners (1/16"–3/8")

VALYRIANTOOL COBALT LEFT HAND DRILL BIT SET

Meet a durable reverse-drilling solution designed to tackle damaged fasteners with confidence. The 15-piece set uses M35 cobalt steel for extended wear resistance, helping you work through stubborn bolts and screws while preserving surrounding material. This isn’t just about drilling; it’s about precision, predictability, and a smoother repair process.

Why choose cobalt left-hand bits

Left-handed geometry paired with a 135-degree split point helps the bit self-center and begin cutting quickly, often reducing the number of passes needed. The result can feel like a cleaner start, even on scratched or rusty surfaces.

• Increased durability for repeated use in tough jobs
• Fast, self-centering cutting minimizes wandering
• Reverse drilling helps back out fasteners with less damage

What’s included

The kit covers a wide range of imperial sizes from 1/16" to 3/8", with several duplicates for common tasks.

• 1/16" (x2)
• 5/64"
• 3/32"
• 7/64"
• 1/8" (x2)
• 9/64"
• 5/32"
• 3/16" (x2)
• 7/32"
• 1/4"
• 5/16"
• 3/8"

How to use

1. Grind or flatten the head of the damaged bolt or screw. 2. Center-mark the spot with a punch and light hammer. 3. Drill in reverse with the bits, using light oil. 4. Often the fastener backs out before the hole finishes. 5. If needed, the hole can serve as a pilot for a screw extractor.

Real-world scenarios

• Automotive or machinery repairs where bolts seize
• Metal panels with corroded or stuck fasteners
• Projects requiring careful material preservation

Packaging and storage

Packed in a sturdy plastic box imprinted with sizes for quick selection and organized storage, ready for toolbox integration.

Note: Results can vary based on material, fastener condition, and drilling technique. This set offers a robust option for reverse drilling and pilot-hole prep, expanding your repair opportunities without overpromising outcomes.